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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4248
Location: Germany
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 Posted: May 02, 2022 01:53 Post subject: Re: Silvia's Collection |
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| Another very beautiful and showy Cavnic specimen, I like it!
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silvia
Joined: 10 Oct 2021
Posts: 253
Location: UK
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| Posted: May 03, 2022 17:32 Post subject: Re: Silvia's Collection |
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| Tobi wrote: | | Another very beautiful and showy Cavnic specimen, I like it! |
Hello Tobi:
Many thanks for your kind words. I suspect that black minerals are not a favourite with many collectors. I see this in the pricing – the lower the iron content of Sphalerite, the greater the price. The ruby red gemmy variants can cost as much as rubies – lol.
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4248
Location: Germany
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| Posted: May 04, 2022 01:50 Post subject: Re: Silvia's Collection |
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| silvia wrote: | | Tobi wrote: | | Another very beautiful and showy Cavnic specimen, I like it! |
Hello Tobi: Many thanks for your kind words. I suspect that black minerals are not a favourite with many collectors. I see this in the pricing – the lower the iron content of Sphalerite, the greater the price. The ruby red gemmy variants can cost as much as rubies – lol. |
I know what you mean, Silvia, but I think it's somehow understandable. Sphalerite in general is a common mineral and even in good crystals it's not that rare. But the red & gemmy ones are something special and thus really expensive. I mean, it's a transparent gemmy sulfide - you don't find that often ;-) I have some translucent (not really gemmy) sphalerites (Germany, Bulgaria & Kazakhstan) in my collection and I really love them but I also like "ordinary" sulfides in grey or black, that's why galena is one of my favourite minerals ;-) Don't forget what I said some time ago in Michael Shaw's collection thread:
| Tobi wrote: | | silvia wrote: | | I know many people have an aversion to black minerals, but some can be absolutely stunning [...] |
Right, some collectors are only into colours and refuse black minerals, but there's also a huge fan base for black and grey, otherwise things like manganite, schorl, cassiterite, galena, stibnite, hematite or several rare silver ores (just to mention a few) would not have become so popular in the mineral collection world :-)
I think judging by the colour is not only stupid when it's about people but also when it's about minerals :-) |
Best regards
Tobi
| silvia wrote: | | I suspect that black minerals are not a favourite with many collectors. I see this in the pricing [...] |
I think people on the hunt for an old German manganite or a good Xuebaoding cassiterite won't agree ;-)
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James Catmur
Site Admin
Joined: 14 Sep 2006
Posts: 1470
Location: Cambridge
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| Posted: May 04, 2022 02:45 Post subject: Re: Silvia's Collection |
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| A German Manganite was always on my 'must find a good one' list. I did eventually find one but then sold it when I narrowed the focus of my collection
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silvia
Joined: 10 Oct 2021
Posts: 253
Location: UK
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| Posted: May 05, 2022 16:35 Post subject: Morocco - Silvia's Collection |
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A ball of Marcasite on Quartz.
| Mineral: | Marcasite, Quartz |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco |  |
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| Dimensions: | 140 mm x 90 mm x 80 mm |
| Description: |
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| Viewed: |
17780 Time(s) |
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| Mineral: | Marcasite, Quartz |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 140 mm x 90 mm x 80 mm |
| Description: |
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| Viewed: |
17783 Time(s) |
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| Mineral: | Marcasite, Quartz |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 140 mm x 90 mm x 80 mm |
| Description: |
| Detail of the crystals - Marcasite ball |
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| Viewed: |
17799 Time(s) |
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| Mineral: | Marcasite, Quartz |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 140 mm x 90 mm x 80 mm |
| Description: |
| Detail of the crystals - matrix side |
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| Viewed: |
17823 Time(s) |
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| Mineral: | - |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Description: |
OUMEJRANE MINE - MANAGEM
Located 90 km from the town of Zagora in southern Morocco, the Oumejrane copper mine has been operational since 2014. It is managed by Managem subsidiary CMO (Compagnie Minière d’Oumejrane) and produces Copper concentrate from 5 different worksites. |
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| Viewed: |
17857 Time(s) |
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| Mineral: | - |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Description: |
Entrance to the underground mine.
We have some wonderful photos of this mine, both surface and underground thanks to Managem. |
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| Viewed: |
17861 Time(s) |
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silvia
Joined: 10 Oct 2021
Posts: 253
Location: UK
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| Posted: May 12, 2022 16:36 Post subject: Siderite - Silvia's Collection |
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Partly iridescent discoidal Siderite crystals with pyrite.
| Mineral: | Siderite, Pyrite, Quartz |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 110 mm x 80 mm x 70 mm |
| Description: |
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| Viewed: |
19781 Time(s) |
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| Mineral: | Siderite, Pyrite, Quartz |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 110 mm x 80 mm x 70 mm |
| Description: |
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| Viewed: |
19828 Time(s) |
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| Mineral: | Siderite, Pyrite, Quartz |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 110 mm x 80 mm x 70 mm |
| Description: |
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| Viewed: |
19809 Time(s) |
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| Mineral: | Siderite, Pyrite, Quartz |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 110 mm x 80 mm x 70 mm |
| Description: |
| Detail of the crystals - Quartz |
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| Viewed: |
19823 Time(s) |
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| Mineral: | Siderite, Pyrite, Quartz |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 110 mm x 80 mm x 70 mm |
| Description: |
| Detail of the crystals - Pyrite |
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| Viewed: |
19788 Time(s) |
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| Mineral: | - |
| Locality: | | Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco | |
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| Description: |
| Inside the processing plant. |
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| Viewed: |
19773 Time(s) |
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Firmo Espinar
Joined: 05 Apr 2017
Posts: 777
Location: Medellín, Colombia.
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| Posted: May 12, 2022 17:12 Post subject: Re: Silvia's Collection |
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Hi Silvia.
This siderite has a wonderful and very nice first sight.
Congratulations.
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silvia
Joined: 10 Oct 2021
Posts: 253
Location: UK
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| Posted: May 13, 2022 16:53 Post subject: Re: Silvia's Collection |
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| Firmo Espinar wrote: | Hi Silvia.
This siderite has a wonderful and very nice first sight.
Congratulations. |
Many thanks for your kind words. I do appreciate the vote of confidence. It was not an easy mineral to photograph, and I took many photos until i was happy.
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silvia
Joined: 10 Oct 2021
Posts: 253
Location: UK
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| Posted: May 15, 2022 17:34 Post subject: Gilbert Gauthier - Silvia's Collection |
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Malachite stalagmites coated with a second generation of Malachite microcrystals.
| Mineral: | Malachite, Cuprite |
| Locality: | | Musonoi Mine, Kolwezi, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of the Congo (Zaire) | |
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| Dimensions: | 10 cm x 8 cm x 6 cm |
| Description: |
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| Viewed: |
19620 Time(s) |
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| Mineral: | Malachite, Cuprite |
| Locality: | | Musonoi Mine, Kolwezi, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of the Congo (Zaire) | |
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| Dimensions: | 10 cm x 8 cm x 6 cm |
| Description: |
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| Viewed: |
19659 Time(s) |
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| Mineral: | Malachite, Cuprite |
| Locality: | | Musonoi Mine, Kolwezi, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of the Congo (Zaire) | |
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| Dimensions: | 10 cm x 8 cm x 6 cm |
| Description: |
| Matrix view - crystalline Malachite intermixed with microcrystalline Cuprite |
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| Viewed: |
19659 Time(s) |
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| Mineral: | Malachite, Cuprite |
| Locality: | | Musonoi Mine, Kolwezi, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of the Congo (Zaire) | |
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| Dimensions: | 10 cm x 8 cm x 6 cm |
| Description: |
| Detail of the matrix crystals |
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| Viewed: |
19588 Time(s) |
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| Mineral: | Malachite, Cuprite |
| Locality: | | Musonoi Mine, Kolwezi, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of the Congo (Zaire) | |
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| Dimensions: | 10 cm x 8 cm x 6 cm |
| Description: |
| Detail of the crystallized malachite coating - main Malachite stalagmite |
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| Viewed: |
19599 Time(s) |
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| Mineral: | - |
| Locality: | | Musonoi Mine, Kolwezi, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of the Congo (Zaire) | |
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| Description: |
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| Viewed: |
19639 Time(s) |
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| Mineral: | - |
| Locality: | | Musonoi Mine, Kolwezi, Kolwezi District, Lualaba, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of the Congo (Zaire) | |
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| Description: |
Musonoi Open Pit
The Musonoi mine has been a locality for many world-class uranium, copper, and cobalt bearing minerals (Oosterbosch et al. 1964, Gauthier et al. 1989). The mine is located in the Democratic Republic of Congo on the outskirts of the mining town of Kolwezi in an area known as the Katanga Copperbelt. The ore-bodies of the Musonoi mine, and the nearby Kamoto mine, have been mined since the beginning of the 20th century for copper and cobalt. Initially, the Musonoi mine was mined for Chalcocite and Digenite.
GAUTHIER, G., FRANÇOIS, A., DELIENS, M. & PIRET, P. (1989): THE URANIUM DEPOSITS OF THE SHABA REGION, ZAÏRE. MINERAL REC. 20, 265-304.
OOSTERBOSCH, R., PICOT, P. & PIERROT, R. (1964): La digenite sélénifère de Musonoï (Katanga). Bull. Soc. fr. Minéral. Cristallogr. 87, 613-617. |
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| Viewed: |
19735 Time(s) |
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silvia
Joined: 10 Oct 2021
Posts: 253
Location: UK
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| Posted: May 22, 2022 18:50 Post subject: Boldut Mine - Silvia's Collection |
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Bright attractive brassy crystals of Chalcopyrite to 1.5 cm in size scattered across the top of the snow white crystallized quartz matrix with platy Calcite.
| Mineral: | Chalcopyrite, Quartz, Calcite |
| Locality: | | Boldut Mine, Cavnic mining area, Cavnic, Maramures, Romania | |
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| Dimensions: | 16 cm x 15 cm x 7 cm |
| Description: |
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| Viewed: |
19483 Time(s) |
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| Mineral: | Chalcopyrite, Quartz, Calcite |
| Locality: | | Boldut Mine, Cavnic mining area, Cavnic, Maramures, Romania | |
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| Dimensions: | 16 cm x 15 cm x 7 cm |
| Description: |
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| Viewed: |
19504 Time(s) |
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| Mineral: | Chalcopyrite, Quartz, Calcite |
| Locality: | | Boldut Mine, Cavnic mining area, Cavnic, Maramures, Romania | |
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| Dimensions: | 16 cm x 15 cm x 7 cm |
| Description: |
| Detail of some of the Chalcopyrite crystals. |
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| Viewed: |
19518 Time(s) |
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| Mineral: | Chalcopyrite, Quartz, Calcite |
| Locality: | | Boldut Mine, Cavnic mining area, Cavnic, Maramures, Romania | |
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| Dimensions: | 16 cm x 15 cm x 7 cm |
| Description: |
| Detail of some of the Calcite crystals. |
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| Viewed: |
19519 Time(s) |
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silvia
Joined: 10 Oct 2021
Posts: 253
Location: UK
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| Posted: May 27, 2022 20:43 Post subject: Uranium - Silvia's Collection |
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The specimen comprises a vuggy Quartz matrix hosting many well-formed crystals of Meta-Torbernite.
Usually Meta-torbernite is a dehydration pseudomorph of Torbernite. However the specimens from El Sherana were formed by direct deposition from a supersaturated solution, which produced true crystalline Meta-torbernite, with a dark green colour, translucent diaphaneity and a vitreous lustre.
| Mineral: | Meta-Torbernite |
| Locality: | | El Sherana Mine, South Alligator River, West Arnhem Region, Northern Territory, Australia | |
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| Dimensions: | 80 mm x 70 mm x 60 mm |
| Description: |
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| Viewed: |
19411 Time(s) |
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| Mineral: | Meta-Torbernite |
| Locality: | | El Sherana Mine, South Alligator River, West Arnhem Region, Northern Territory, Australia | |
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| Dimensions: | 80 mm x 70 mm x 60 mm |
| Description: |
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| Viewed: |
19439 Time(s) |
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| Mineral: | Meta-Torbernite |
| Locality: | | El Sherana Mine, South Alligator River, West Arnhem Region, Northern Territory, Australia | |
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| Dimensions: | 80 mm x 70 mm x 60 mm |
| Description: |
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| Viewed: |
19448 Time(s) |
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| Mineral: | _ |
| Locality: | | El Sherana Mine, South Alligator River, West Arnhem Region, Northern Territory, Australia | |
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| Description: |
| Picture of the camp - courtesy Al Yates |
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| Viewed: |
19423 Time(s) |
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silvia
Joined: 10 Oct 2021
Posts: 253
Location: UK
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| Posted: Jun 02, 2022 16:31 Post subject: Classic Minerals - Bisbee - Silvia's Collection |
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A highly lustrous cluster of deep inky-blue Azurite crystals from the classic Bisbee mining district in Cochise County, Arizona, USA. The specimen contains sharp, arrow-shaped terminated Azurite crystals, to about 15 mm long on a limonitic matrix.
| Mineral: | Azurite |
| Locality: | | Bisbee, Warren District, Mule Mountains, Cochise County, Arizona, USA | |
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| Dimensions: | 120 mm x 100 mm x 30 mm |
| Description: |
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| Viewed: |
19301 Time(s) |
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| Mineral: | Azurite |
| Locality: | | Bisbee, Warren District, Mule Mountains, Cochise County, Arizona, USA | |
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| Dimensions: | 120 mm x 100 mm x 30 mm |
| Description: |
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| Viewed: |
19298 Time(s) |
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| Mineral: | Azurite |
| Locality: | | Bisbee, Warren District, Mule Mountains, Cochise County, Arizona, USA | |
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| Dimensions: | 120 mm x 100 mm x 30 mm |
| Description: |
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| Viewed: |
19291 Time(s) |
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Philippe Durand
Joined: 10 May 2016
Posts: 653
Location: Normandie
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4248
Location: Germany
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| Posted: Jun 03, 2022 02:30 Post subject: Re: Silvia's Collection |
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| Congratulations Silvia, an outstanding specimen from a legendary azurite locality!
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rweaver
Joined: 13 Apr 2009
Posts: 259
Location: Ridgecrest, California
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| Posted: Jun 03, 2022 08:34 Post subject: Re: Silvia's Collection |
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A note from Les Presmyk on the Copper Queen location.
As a general statement there are very few verifiable azurites and malachite’s from the Copper Queen mine and the few that I know of are fairly average. The Copper Queen mine only operated from 1884 to 1888, when the Czar and Holbrook mines were developed and opened. In addition, these became the primary specimen producers for the next 10 or 15 years. And, if you have any of my labels saying they are from the Copper Queen, they are wrong. This is the result of the research I did for our book. And I don't remember how many dozens of labels I had to change as well.
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