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Collection of Michael Shaw
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crosstimber
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PostPosted: Apr 04, 2017 13:34    Post subject: Re: Collection of Michael Shaw  

Tsumeb


2450 Aragonite var. nicholsonite.jpg
 Mineral: Aragonite
 Locality:
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
 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.
 Viewed:  695 Time(s)

2450 Aragonite var. nicholsonite.jpg



2452 Calcite.jpg
 Mineral: Calcite
 Locality:
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
 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.
 Viewed:  695 Time(s)

2452 Calcite.jpg



2431 Aragonite var. tarnowitzite.jpg
 Mineral: Aragonite
 Locality:
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
 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.
 Viewed:  693 Time(s)

2431 Aragonite var. tarnowitzite.jpg


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PostPosted: Apr 08, 2017 11:36    Post subject: Re: Collection of Michael Shaw  

...


Pyrite with bertrandite.JPG
 Mineral: Pyrite and bertrandite
 Locality:
Akchatau, Karagandy Province (Karaganda Oblast'), Kazakhstan
 Dimensions: 4.0 x 6.0 x 9.0 cm
 Description:
Lustrous cubic pyrite crystals replacing pyrrhotite associated with sprays of acicular white bertrandite.
 Viewed:  578 Time(s)

Pyrite with bertrandite.JPG



2455 Bertrandite Kazakhstan.JPG
 Mineral: Bertrandite
 Dimensions: 4.0 x 6.0 x 9.0 cm
 Description:
Closer view of the bertrandite.
 Viewed:  580 Time(s)

2455 Bertrandite Kazakhstan.JPG


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PostPosted: Apr 10, 2017 17:15    Post subject: Re: Collection of Michael Shaw  

...


2429 Olmiite.jpg
 Mineral: Olmiite
 Locality:
N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
 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.
 Viewed:  532 Time(s)

2429 Olmiite.jpg


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Jamison Brizendine




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PostPosted: Apr 11, 2017 13:36    Post subject: Re: Collection of Michael Shaw  

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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crosstimber
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PostPosted: Apr 11, 2017 14:00    Post subject: Re: Collection of Michael Shaw  

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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PostPosted: Apr 13, 2017 09:19    Post subject: Re: Collection of Michael Shaw  

Herja Mine, Romania.


2458 Siderite.jpg
 Mineral: Siderite
 Locality:
Herja Mine, Chiuzbaia, Baia Mare, Maramures, Romania
 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.
 Viewed:  383 Time(s)

2458 Siderite.jpg



2456 Calcite - Herja Mine.jpg
 Mineral: Calcite
 Locality:
Herja Mine, Chiuzbaia, Baia Mare, Maramures, Romania
 Dimensions: 3.5 x 5.0 x 5.0 cm.
 Description:
A divergent cluster of sugary-textured light tan calcite scalenohedrons.
 Viewed:  385 Time(s)

2456 Calcite - Herja Mine.jpg


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PostPosted: Apr 19, 2017 15:35    Post subject: Re: Collection of Michael Shaw  

A few more from the Herja Mine, Romania.


2454 Freibergite.jpg
 Mineral: Freibergite
 Locality:
Herja Mine, Chiuzbaia, Baia Mare, Maramures, Romania
 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.
 Viewed:  313 Time(s)

2454 Freibergite.jpg



2454 Calcite - Herja Mine.jpg
 Mineral: Calcite
 Locality:
Herja Mine, Chiuzbaia, Baia Mare, Maramures, Romania
 Dimensions: 1.0 x 6.0 x 8.5 cm
 Description:
Reverse side of the specimen shown above.
 Viewed:  307 Time(s)

2454 Calcite - Herja Mine.jpg



2459 Stibnite.jpg
 Mineral: Stibnite
 Locality:
Herja Mine, Chiuzbaia, Baia Mare, Maramures, Romania
 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.
 Viewed:  309 Time(s)

2459 Stibnite.jpg


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Jamison Brizendine




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PostPosted: Apr 20, 2017 09:44    Post subject: Re: Collection of Michael Shaw  

crosstimber wrote:
Jamison Brizendine wrote:
I had to chuckle over your olmiite ( http://www.mineral-forum.com/message-board/download.php?id=77985 ). 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

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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crosstimber
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PostPosted: Apr 20, 2017 10:39    Post subject: Re: Collection of Michael Shaw  

Jamison Brizendine wrote:
crosstimber wrote:
Jamison Brizendine wrote:
I had to chuckle over your olmiite ( http://www.mineral-forum.com/message-board/download.php?id=77985 ). 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

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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PostPosted: Apr 24, 2017 08:54    Post subject: Re: Collection of Michael Shaw  

...


2457 Calcite - Cavnic, Romania.jpg
 Mineral: Calcite
 Locality:
Boldut Mine, Cavnic mining area, Cavnic, Maramures, Romania
 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.
 Viewed:  122 Time(s)

2457 Calcite - Cavnic, Romania.jpg


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