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Michael Shaw
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Joined: 30 Apr 2008
Posts: 2061
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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20281 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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20234 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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20275 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
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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20169 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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20159 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
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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20147 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: 2061
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: 2061
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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19981 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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19964 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
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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19936 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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19882 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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19887 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: 2061
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: 2061
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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19724 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
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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19618 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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19561 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
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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19426 Time(s) |
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Mineral: | Malachite |
Locality: | L'Etoile du Congo Mine (Star of the 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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19560 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2854
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: 2061
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: 2061
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: |
19277 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
Location: Oklahoma
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Posted: May 11, 2017 09:14 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Fluorite |
Locality: | Hidalgo del Parral, Municipio Hidalgo del Parral, Chihuahua, Mexico | |
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Dimensions: | 3.5 x 5.5 cm |
Description: |
An intergrown group of frosted, mint green, octahedral fluorite crystals partially covered with lustrous white calcite crystals. |
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Viewed: |
19095 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
Location: Oklahoma
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Posted: May 15, 2017 12:50 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Brucite |
Locality: | Maxwell Quarry, Wakefield, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada | |
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Dimensions: | 5.5 x 7.2 cm |
Description: |
A foliated mass of pearly-lustered white brucite. |
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19200 Time(s) |
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Mineral: | Vivianite |
Locality: | Bessemer City Quarry, Bessemer City, Gaston County, North Carolina, USA | |
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Dimensions: | 6.5 x 9.5 cm |
Description: |
Dark green to black vivianite crystals lying flat on a matrix of albite, quartz, and muscovite. |
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18993 Time(s) |
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Mineral: | Vivianite |
Locality: | Bessemer City Quarry, Bessemer City, Gaston County, North Carolina, USA | |
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Dimensions: | FOV - 2.5 x 3.0 cm |
Description: |
Closer view of crystal group on lower right. |
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Viewed: |
18979 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
Location: Oklahoma
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Posted: May 18, 2017 10:15 Post subject: Re: Collection of Michael Shaw |
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A rainy day is always a good recipe for a photo session.
Mineral: | Cuprite |
Locality: | Poteryaevskoe Mine, Rubtsovsky District, Altai Krai, Russia | |
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Dimensions: | 1.9 x 2.1 cm |
Description: |
A complex octahedron of dark red cuprite with a small aggregate of native silver. |
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Viewed: |
18920 Time(s) |
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Mineral: | Hematite |
Locality: | Bouse, Plomosa District, Plomosa Mountains, La Paz County, Arizona, USA | |
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Dimensions: | 2.0 x 2.5 cm |
Description: |
A loose floater of bright metallic black hematite crystals. |
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18908 Time(s) |
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Mineral: | Calcite |
Locality: | Alzada, Carter County, Montana, USA | |
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Dimensions: | 1.0 x 2.9 cm |
Description: |
Orange brown stalactitic calcite. |
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Viewed: |
18899 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
Location: Oklahoma
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Posted: May 19, 2017 15:06 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Zircon |
Locality: | Peixe alkaline complex, Peixe, Tocantins, Norte Region, Brazil | |
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Dimensions: | 1.2 x 2.1 cm |
Description: |
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18876 Time(s) |
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Mineral: | Pyrite |
Locality: | Ross County, Ohio, USA | |
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Dimensions: | 1.6 x 2.2 cm |
Description: |
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18793 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2061
Location: Oklahoma
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Posted: May 22, 2017 15:37 Post subject: Re: Collection of Michael Shaw |
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A couple of new pieces from Germany.
Mineral: | Siderite and Galena on Fluorite |
Locality: | Freiberg District, Erzgebirgskreis, Saxony/Sachsen, Germany | |
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Dimensions: | 4.0 x 7.0 cm |
Description: |
Colorless fluorite cubes hosting light brown siderite crystals and small spinel-twinned galena crystals. |
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18704 Time(s) |
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Mineral: | Galena |
Locality: | Freiberg District, Erzgebirgskreis, Saxony/Sachsen, Germany | |
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Description: |
A closeup view of the twinned galena crystals. |
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18697 Time(s) |
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Mineral: | Crocoite |
Locality: | Callenberg, Zwickau, Saxony/Sachsen, Germany | |
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Dimensions: | 8.0 x 10.5 cm |
Description: |
Bright orange-red prismatic crocoite crystals on a brown matrix from the Callenberg North Open Cut. |
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18698 Time(s) |
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