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Michael Shaw
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Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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 Posted: Apr 04, 2017 13:34 Post subject: Re: Collection of Michael Shaw |
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Tsumeb
| Mineral: | Aragonite |
| Locality: | | Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia |  |
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| Dimensions: | 5.0 x 6.7 cm. |
| Description: |
| Pseudohexagonal aragonite with pyramidal white terminations and yellowish prism faces. Small cerussite crystals are present on the back side. According to the label this is a zincian-rich variety known as nicholsonite. I plan to get this piece analyzed to find out if that is true. |
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| Viewed: |
25498 Time(s) |
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| Mineral: | Calcite |
| Locality: | | Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia | |
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| Dimensions: | 2.8 x 3.6 cm |
| Description: |
| An aggregate of cream-colored calcite crystals with a satin luster and sugary texture covering the top of a thin pink cast of dolomite. |
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| Viewed: |
25444 Time(s) |
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| Mineral: | Aragonite |
| Locality: | | Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia | |
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| Dimensions: | 3.8 x 4.6 cm. |
| Description: |
| Crystals of aragonite var. tarnowitzite with white pyramidal terminations and grayish prism zones resting on a gray cerussite matrix with transparent yellow mimetites. |
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| Viewed: |
25471 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: Apr 08, 2017 11:36 Post subject: Re: Collection of Michael Shaw |
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...
| Mineral: | Pyrite and bertrandite |
| Locality: | | Akchatau, Shet, Karaganda Region, Kazakhstan | |
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| Dimensions: | 4.0 x 6.0 x 9.0 cm |
| Description: |
| Lustrous cubic pyrite crystals replacing pyrrhotite associated with sprays of acicular white bertrandite. |
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| Viewed: |
25347 Time(s) |
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| Mineral: | Bertrandite |
| Dimensions: | 4.0 x 6.0 x 9.0 cm |
| Description: |
| Closer view of the bertrandite. |
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| Viewed: |
25351 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: Apr 10, 2017 17:15 Post subject: Re: Collection of Michael Shaw |
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...
| Mineral: | Olmiite |
| Locality: | | N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa | |
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| Dimensions: | 3.6 x 4.7 cm |
| Description: |
| Translucent pinkish-tan olmiite crystals with a wheat-sheaf habit on a matrix of transparent colorless calcite and brown gageite. Exhibits intense red fluorescence under SW UV. Collected by Paul Balayer in September 2016. |
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| Viewed: |
25355 Time(s) |
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Jamison Brizendine
Joined: 27 Feb 2014
Posts: 128
Location: Northeast Ohio
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| Posted: Apr 11, 2017 13:36 Post subject: Re: Collection of Michael Shaw |
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| I had to chuckle over your olmiite. I just attended a mineral show last weekend and picked up a nice, inexpensive olmiite. Your's though is a lot more attractive than mine!
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: Apr 11, 2017 14:00 Post subject: Re: Collection of Michael Shaw |
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| Jamison Brizendine wrote: | | I had to chuckle over your olmiite. I just attended a mineral show last weekend and picked up a nice, inexpensive olmiite. Your's though is a lot more attractive than mine! |
Thanks Jamison. Do you know if yours fluoresces? I have another older olmiite and when I checked, it does not fluoresce like the one in my last post. This makes me wonder what the activator is.
Michael
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: Apr 13, 2017 09:19 Post subject: Re: Collection of Michael Shaw |
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Herja Mine, Romania.
| Mineral: | Siderite |
| Locality: | | Herja Mine, Chiuzbaia, Baia Sprie, Maramures, Romania | |
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| Dimensions: | 8.0 x 12.0 x 14.0 cm |
| Description: |
| Lustrous brown crystallized siderite preferentially coated with white calcite crystals on a matrix of sulfides and country rock. |
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| Viewed: |
25183 Time(s) |
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| Mineral: | Calcite |
| Locality: | | Herja Mine, Chiuzbaia, Baia Sprie, Maramures, Romania | |
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| Dimensions: | 3.5 x 5.0 x 5.0 cm. |
| Description: |
| A divergent cluster of sugary-textured light tan calcite scalenohedrons. |
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| Viewed: |
25137 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: Apr 19, 2017 15:35 Post subject: Re: Collection of Michael Shaw |
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A few more from the Herja Mine, Romania.
| Mineral: | Freibergite |
| Locality: | | Herja Mine, Chiuzbaia, Baia Sprie, Maramures, Romania | |
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| Dimensions: | 1.0 x 6.0 x 8.5 cm |
| Description: |
| Lustrous crystals of metallic freibergite averaging 0.3 cm in size scattered over one side of a floater cluster of colorless pearly calcite crystals. |
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| Viewed: |
25148 Time(s) |
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| Mineral: | Calcite |
| Locality: | | Herja Mine, Chiuzbaia, Baia Sprie, Maramures, Romania | |
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| Dimensions: | 1.0 x 6.0 x 8.5 cm |
| Description: |
| Reverse side of the specimen shown above. |
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| Viewed: |
25069 Time(s) |
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| Mineral: | Stibnite |
| Locality: | | Herja Mine, Chiuzbaia, Baia Sprie, Maramures, Romania | |
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| Dimensions: | 2.5 x 3.5 x 4.0 cm |
| Description: |
| A divergent spray of lustrous metallic stibnite crystals set on a small amount of quartz matrix. |
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| Viewed: |
25059 Time(s) |
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Jamison Brizendine
Joined: 27 Feb 2014
Posts: 128
Location: Northeast Ohio
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| Posted: Apr 20, 2017 09:44 Post subject: Re: Collection of Michael Shaw |
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| crosstimber wrote: |
Thanks Jamison. Do you know if yours fluoresces? I have another older olmiite and when I checked, it does not fluoresce like the one in my last post. This makes me wonder what the activator is.
Michael |
Michael, I tested out my Olmiite with my WTC Fluorescent lamp. The response is strongest under a shortwave, showing a magenta color. The fluorescent response is weaker in midwave and longwave. As per what the activator for the fluorescence is I don't know...
Also love those Romanian specimens! I particularly like the Freibergite.
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: Apr 20, 2017 10:39 Post subject: Re: Collection of Michael Shaw |
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| Jamison Brizendine wrote: | | crosstimber wrote: |
Thanks Jamison. Do you know if yours fluoresces? I have another older olmiite and when I checked, it does not fluoresce like the one in my last post. This makes me wonder what the activator is.
Michael |
Michael, I tested out my Olmiite with my WTC Fluorescent lamp. The response is strongest under a shortwave, showing a magenta color. The fluorescent response is weaker in midwave and longwave. As per what the activator for the fluorescence is I don't know...
Also love those Romanian specimens! I particularly like the Freibergite. |
Thanks Jamison. That's interesting, I suppose the activator is manganese and maybe a certain threshold is required to render it fluorescent. The olmiites on other specimen I have that are not fluorescent are not as gemmy and tan colored, so I'm pretty certain that the chemistry is slightly different.
Michael
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: Apr 24, 2017 08:54 Post subject: Re: Collection of Michael Shaw |
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...
| Mineral: | Calcite |
| Locality: | | Boldut Mine, Cavnic mining area, Cavnic, Maramures, Romania | |
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| Dimensions: | 4.5 x 5.0 x 7.0 cm, |
| Description: |
| Thin platy crystals of calcite to 6.0 cm standing upright from a matrix accented with chalcopyrite crystals. |
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| Viewed: |
24933 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: May 01, 2017 09:48 Post subject: Re: Collection of Michael Shaw |
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...
| Mineral: | Fluorite |
| Locality: | | Chebka Sidi Said, Midelt Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 6.4 x 6.6 cm |
| Description: |
| Cubic yellow fluorite crystals to 2.0 cm on edge partially coated with colorless quartz. |
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| Viewed: |
24815 Time(s) |
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| Mineral: | Galena |
| Locality: | | Mibladen (Mibladen mining district), Midelt, Midelt Province, Drâa-Tafilalet Region, Morocco | |
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| Dimensions: | 3.0 x 4.0 cm |
| Description: |
| Semi-lustrous cubic galena crystals with octahedral modifications and minor quartz. It is interesting to note that there are very few galena specimens on the market from this location despite it being a lead-rich area. |
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| Viewed: |
24762 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: May 04, 2017 14:14 Post subject: Re: Collection of Michael Shaw |
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...
| Mineral: | Orpiment |
| Locality: | | Elbrusskiy Mine, Elbrus Mountain, Kabardino-Balkarian Republic, Northern Caucasus Region, Russia | |
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| Dimensions: | 1.7 x 2.8 cm |
| Description: |
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| Viewed: |
24653 Time(s) |
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| Mineral: | Malachite |
| Locality: | | L'Etoile du Congo Mine, Lubumbashi (Elizabethville), Katanga Copper Crescent, Haut-Katanga (Shaba), Democratic Republic of the Congo (Zaire) | |
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| Dimensions: | 1.2 x 2.9 cm |
| Description: |
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| Viewed: |
24786 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2919
Location: Arkansas
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| Posted: May 04, 2017 15:21 Post subject: Re: Collection of Michael Shaw |
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Michael,
I had to put my sunglasses on to look at your excellent vivid Orpiment. I was afraid it was going to punch my eyeballs out. Congratulations.
Hi to Laura.
Don
_________________
hogwild |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: May 04, 2017 16:55 Post subject: Re: Collection of Michael Shaw |
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| Don Lum wrote: | Michael,
I had to put my sunglasses on to look at your excellent vivid Orpiment. I was afraid it was going to punch my eyeballs out. Congratulations.
Hi to Laura.
Don |
Thank you Don. Yes, those Elbrusskiy Mine orpiments can be pretty bright. I have been enjoying your thread, especially the pieces from the Stand-on-your-Head mine. Have to agree with you about Jimmie and Hisami - very nice folks. Say hi to Gwen.
Michael
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2252
Location: Oklahoma
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| Posted: May 08, 2017 16:51 Post subject: Re: Collection of Michael Shaw |
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...
| Mineral: | Fluorite |
| Locality: | | Wölsendorf Mining District, Upper Palatinate/Oberpfalz, Bavaria/Bayern, Germany | |
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| Dimensions: | 7.5 x 8.5 cm |
| Description: |
| A plate of lustrous zoned greenish/gray, cubic fluorite with localized reddish inclusions of hematite from Nabburg. |
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| Viewed: |
24465 Time(s) |
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