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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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 Posted: Mar 15, 2025 15:16 Post subject: MVM (Minerals - Virtual Museum) Collection / Sphalerite from Áliva with geometric banding |
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#MVM (Minerals - Virtual Museum) - more information about the piece with this link
| Mineral: | Sphalerite |
| Locality: | | Áliva mining area, Camaleño, Comarca Liébana, Cantabria, Spain |  |
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| Dimensions: | 5.5 × 5 × 1.1 cm |
| Description: |
| Polycrystalline growth of lustrous, transparent and polychrome Sphalerite, with aesthetic geometric banding with very marked color changes. The specimen comes from the Lluís Daunis collection. |
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2291 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 16, 2025 16:10 Post subject: Silver crystals from Morocco / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) - more information about the piece with this link
| Mineral: | Silver on Calcite |
| Locality: | | Aït Ahmane, Agdz, Bou Azzer mining district, Zagora Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | main crystal size: 0.3 × 0.2 cm |
| Description: |
| Isolated cubic Silver groups and crystals with extraordinarily well defined faces and edges, very bright and on a rock matrix with Calcite. |
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2220 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 18, 2025 17:19 Post subject: Tricolor Elbaite from Rubaya, Congo / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) - more information about the piece with this link
| Mineral: | Elbaite |
| Locality: | | Rubaya, Bahunde, Masisi Territory, North Kivu Province (Kivu), Democratic Republic of the Congo (Zaire) | |
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| Dimensions: | 7 × 1.2 × 1 cm |
| Description: |
An isolated, doubly terminated elbaite crystal exhibiting pronounced hemihedral symmetry. The crystal showcases well-defined forms with sharp terminations: the upper end displays a prismatic habit, while the opposite end terminates in a pedion. It is transparent and possesses a high luster.
The prism's base transitions from pink color up to the midpoint, with subtle gradations of yellow color, culminating in a pale, uniform green color at the termination. |
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2103 Time(s) |
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Roger Warin
Joined: 23 Jan 2013
Posts: 1231
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| Posted: Mar 19, 2025 00:43 Post subject: Re: #MVM (Minerals - Virtual Museum) Collection |
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Hello Jordi,
Do we know about the color centers? We are in the REE region.
Do these pretty hues tire in the light?
Thank you.
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 19, 2025 06:43 Post subject: Tricolor Elbaite from Rubaya, Congo - color centers? / colors may fade? |
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| Roger Warin wrote: |
...Do we know about the color centers? We are in the REE region.
Do these pretty hues tire in the light?...
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To my knowledge, I'm uncertain whether the color centers in Rubaya Tourmalines are due to rare earth elements (REE). However, it is true that the vast majority of Tourmalines from that region exhibit two, three, or more different colors (see in #MVM) :
https://www.fabreminerals.com/search_results.php?LANG=EN&SearchTerms=Rubaya&submit=Search&MineralSpecimen=&pais=&PriceRange=&Currency=USD%28%24%29&SizeRange=
Regarding whether the colors of these Elbaites may fade after prolonged exposure to any type of light, to my knowledge, this does not happen. However, since these specimens appeared on the market around 2020, more time will need to pass before this can be confirmed with complete certainty.
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 20, 2025 13:59 Post subject: Sharp Sphalerite from Spain / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) - more information about the piece with this link
| Mineral: | Sphalerite with Dolomite |
| Locality: | | Áliva Mine (Las Mánforas Mine), Áliva mining area, Camaleño, Comarca Liébana, Cantabria, Spain | |
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| Dimensions: | 3.5 × 3.3 × 1.8 cm |
| Description: |
Sphalerite crystals exhibiting complex yet unusually well-defined forms for this locality.
They are bright, highly transparent, and display an intense, uniform honey-yellow color. |
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| Viewed: |
1774 Time(s) |
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| Mineral: | Sphalerite with Dolomite |
| Locality: | | Áliva Mine (Las Mánforas Mine), Áliva mining area, Camaleño, Comarca Liébana, Cantabria, Spain | |
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| Dimensions: | 3.5 × 3.3 × 1.8 cm |
| Description: |
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| Viewed: |
1766 Time(s) |
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James Catmur
Site Admin
Joined: 14 Sep 2006
Posts: 1461
Location: Cambridge
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| Posted: Mar 21, 2025 09:02 Post subject: Re: Sharp Sphalerite from Spain / MVM (Minerals - Virtual Museum) Collection |
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Lovely
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 22, 2025 11:28 Post subject: Malachite from Katanga / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) - more information about the piece with this link
| Mineral: | Malachite |
| Locality: | | Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of the Congo (Zaire) | |
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| Dimensions: | 4.2 × 3.3 × 3.1 cm |
| Description: |
| Elegant pedunculated Malachite growth with botryoidal shapes and color changes over a range of greens, from dark to very vivid and intense. |
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| Viewed: |
1326 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 23, 2025 18:04 Post subject: Iridescent Goethite from Spain / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) - more information about the piece with this link
| Mineral: | Quartz with Goethite |
| Locality: | | San Valentín open pit, Sancti Espíritu, Sierra Minera de Cartagena-La Unión, La Unión, Comarca Campo de Cartagena, Region of Murcia (Murcia), Spain | |
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| Dimensions: | 18.4 × 10.4 × 4.6 cm |
| Description: |
| Quartz crystal druse with mainly pyramid faces and just minimal prism faces, coated with iridescent Goethite in green, blue and violet hues. |
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| Viewed: |
1212 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 24, 2025 16:24 Post subject: Sphalerite from Taolin / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) - more information about the piece with this link
| Mineral: | Sphalerite on Quartz |
| Locality: | | Taolin Mine, Linxiang, Yueyang Prefecture, Hunan Province, China | |
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| Dimensions: | main crystal size: 1 × 1 cm |
| Description: |
Some sphalerites from China closely resemble the Spanish ones from Áliva, and although it is often said that their transparency and luster are inferior, some pieces have a quality comparable to or even superior to the Spanish ones. This is the case with this piece, which also stands out for its contrast with the white Quartz matrix.
The specimen has been published in the book 'China', by Berthold Ottens, on page 362 |
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1116 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 25, 2025 16:43 Post subject: Twinned Spinel from Myanmar / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) / more information about the piece with this link
| Mineral: | Spinel (twinned) on Calcite |
| Locality: | | Pein-Pyit, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region (Mandalay Division), Myanmar (Burma) | |
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| Dimensions: | 2.6 × 2.4 × 1.8 cm |
| Description: |
The Myanmar spinels are well known for their quality, color and transparency.
We have seen quite a few specimens, and very rarely, we come across twinned spinels. In this case, the twin is very clear, and its form is very well-defined. |
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| Viewed: |
991 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 27, 2025 17:41 Post subject: Brazilian Elbaite with color zoning / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) / more information about the piece with this link
| Mineral: | Elbaite |
| Locality: | | Cruzeiro Mine, Santa Maria do Suaçui, Governador Valadares, Vale do Rio Doce, Minas Gerais, Brazil | |
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| Dimensions: | 9.3 × 5.6 × 5 cm |
| Description: |
Group of Elbaite crystals, one of them clearly dominant, between transparent and translucent, lustrous, and with geometric color zoning. The main crystal is complete and several of the secondary ones show the typical pegmatite formation fractures.
This piece comes from the Peter Rosewarne collection (number Rc560) and the photo was taken with backlighting. |
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| Viewed: |
846 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 29, 2025 18:31 Post subject: Fluorapophyllite-(K) with Stilbite-Ca / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) / more information about the piece with this link
| Mineral: | Fluorapophyllite-(K) with Stilbite-Ca |
| Locality: | | Pune District (Poonah District), Maharashtra, India | |
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| Dimensions: | main crystal size: 3.5 × 2 cm |
| Description: |
| Aggregates of very sharp Fluorapophyllite-(K) crystals that are very transparent and bright, with an intense and uniform green color and on a basalt matrix coated by pink Stilbite-Ca crystals. |
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| Viewed: |
714 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Mar 31, 2025 14:00 Post subject: Spinel on Calcite from Pein-Pyit / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) / more information about the piece with this link
| Mineral: | Spinel on Calcite |
| Locality: | | Pein-Pyit, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region (Mandalay Division), Myanmar (Burma) | |
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| Dimensions: | main crystal size: 0.6 × 0.4 cm |
| Description: |
Group of crystals of excellent color, luster and transparency and on Calcite matrix.
The main crystal clearly shows, on its upper part, the twin that is named for the species (spinel twin) |
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| Viewed: |
630 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5020
Location: Barcelona
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| Posted: Apr 01, 2025 15:52 Post subject: Stannite with Zinkenite from Bolivia / MVM (Minerals - Virtual Museum) Collection |
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#MVM (Minerals - Virtual Museum) / more information about the piece with this link
| Mineral: | Stannite (twinned) with Zinkenite |
| Locality: | | San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia | |
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| Dimensions: | 4 × 2.3 × 1.7 cm |
| Description: |
Twinned, giant (for the species) and sharp crystals of Stannite. It came from the finds of old miners in the famous San José Mine. The sample is exceptional both for the quality of Stannite and its esthetics and for the presence of acicular crystals of Zinkenite.
The specimen's photo has been reviewed and published in the magazine ‘Rocks & Minerals’ on page 460 in the volume 81, number 6, and in the magazine ‘extraLAPIS - English edition’ on page 31, number 12, "Bolivia" |
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| Viewed: |
553 Time(s) |
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