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Jim Robison
Joined: 17 Nov 2010
Posts: 55
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Posted: May 03, 2014 19:54 Post subject: Re: The Mizunaka Collection |
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AM
Your latest Tsumeb smithsonite is beyond lovely. Very nice indeed. The yellow bleb inclusions are commonly attributed to either cadmium or greenockite (cadmium sulfide). Unfortunately, there is not any analysis I am aware of to confirm this, but it is the logical mineral. I have several in my Tsumeb smithsonite suite, and they all came with that attribution.
It would be very interesting to see a magnified view of the edge of the specimen. Tsumeb dolomite casts (epimorphs) are a particular passion of mine, and whenever I see a Tsumeb cast I am always suspicious. It does appear, in a couple of places, that there is a thin brown layer separating the quartz and the smithsonite. If present, it would be a very good indicator for dolomite stained by iron oxides. If it is indeed a cast, then this would be the first piece I have seen with quartz in association. A very rare critter indeed.
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 03, 2014 21:50 Post subject: Re: The Mizunaka Collection |
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Jim, I have taken a photo of the edge of the piece as well as what appears to be a seam running through part of the shell.
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Smithsonite, Quartz Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Specimen Edge |
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39167 Time(s) |
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Smithsonite, Quartz Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Seam |
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39194 Time(s) |
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Jim Robison
Joined: 17 Nov 2010
Posts: 55
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Posted: May 03, 2014 22:47 Post subject: Re: The Mizunaka Collection |
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Mike Your excellent new pics have a puzzle or two in them. On the second shot, with the layered material it seems most likely you are looking at dolomite. The first pic has an anomaly in that there is an obvious area where there is no intermediate material between the two sides. Very unusual. So let's back up a bit.
I went back to much expanded views of the first two pics, and am wondering about the quartz ID. Smithsonite can display a habit much like your piece shows. Have you checked hardness and/or dilute HCL reaction?. I observed a few areas where it appears there are clear rhombs, consistent with smithsonite, and with a wavy surface texture similar to some smithsonite. I think calcite is unlikely. There do not appear to be many, if any, typical quartz terminations.
Looking back at the first two pics in an expanded magnified view, there is clear evidence on the bottom of one view of a typical dolomite cast layer. There are some unusual things happening here. Fascinating specimen.
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 04, 2014 02:24 Post subject: Re: The Mizunaka Collection |
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Jim, I have not checked the hardness or tried to do an dilute HCL reaction test.
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Jim Robison
Joined: 17 Nov 2010
Posts: 55
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Posted: May 04, 2014 21:48 Post subject: Re: The Mizunaka Collection |
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Mike
A simple scratch test with a steel needle in an out of the way place on the clear crystals would give a good indicator on the quartz versus smithsonite question.
I've been reminded by a good Tsumeb oriented friend that I was probably premature in calling it a dolomite cast. Indeed, a test of the brown layer, and another of the white grainy material would answer the question and if you are so inclined, that would be the way to go. Conversely, it may not be worth spending the money to get an answer.
Your excellent high resolution pictures, with the ability to zoom on a small area, are really fantastic. I always look forward to seeing your work, and now that I've belatedly realized what I can look at in detail they add wonderfully to your work.
The ID of the rock is interesting, and I would love to have the piece in hand for close examination, but the pictures get me really close. Thanks, Jim
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 04, 2014 23:50 Post subject: Re: The Mizunaka Collection |
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Jim, I took a needle to a small clear crystal on the backside and it did not scratch it.
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 07, 2014 04:16 Post subject: Re: The Mizunaka Collection |
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The quartz with rutile is from a small find found in 2001/2002 near the Rist Mine in Hiddenite, North Carolina. The smoky quartz is very glassy and has distinct zoning that is not clearly visible in the photograph. The red arrow marks a movable bubble.
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Quartz, Rutile Hiddenite, Alexander Co., North Carolina, USA 3.9 x 2.8 cm |
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38956 Time(s) |
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Quartz, Rutile Hiddenite, Alexander Co., North Carolina, USA Back Side |
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38744 Time(s) |
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Quartz (var Smoky Quartz) Rist Mine, Hiddenite, Alexander Co., North Carolina, USA 6.5 x 3.8 cm |
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38797 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 08, 2014 19:11 Post subject: Re: The Mizunaka Collection |
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Baryte Jebel Ouichane, Beni Bou Ifrour, Nador, Nador Province, Oriental Region, Morocco 7.8 x 7.0 cm |
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38901 Time(s) |
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Baryte Jebel Ouichane, Beni Bou Ifrour, Nador, Nador Province, Oriental Region, Morocco 7.8 x 7.0 cm |
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38973 Time(s) |
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Silver Kongsberg, Buskerud, Norway 3.5 x 4.5 cm |
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39106 Time(s) |
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Mike Wood
Joined: 16 Dec 2010
Posts: 456
Location: Northern England
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Posted: May 09, 2014 14:30 Post subject: Re: The Mizunaka Collection |
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Lovely quartzes from Rist Mine, Mike. The blue Baryte specimen from Morrocco looks mouthwateringly good, and excellent contrast with the matrix!
Thanks, Mike
_________________ Rock basher |
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 10, 2014 01:39 Post subject: Re: The Mizunaka Collection |
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Thanks Mike. I really like the Baryte specimen too and I think the quartz pieces are a little different than the usual for that locality.
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Baryte, Quartz Jinkouhe District, Leshan Prefecture, Sichuan Province, China 9.7 x 8.3 cm |
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38904 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4112
Location: Germany
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Posted: May 10, 2014 02:30 Post subject: Re: The Mizunaka Collection |
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am mizunaka wrote: | Baryte, Quartz
Jinkouhe District, Leshan Prefecture, Sichuan Province, China
9.7 x 8.3 cm |
Are there two generations of Baryte? Looks like some are honey-coloured and some white with some coating ...
Cheers!
Tobi
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 10, 2014 17:38 Post subject: Re: The Mizunaka Collection |
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Tobi, I think that the white coating is a fine layer of quartz.
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4112
Location: Germany
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Posted: May 11, 2014 01:22 Post subject: Re: The Mizunaka Collection |
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am mizunaka wrote: | Tobi, I think that the white coating is a fine layer of quartz. |
OK, and the yellow Barytes? Uncoated several crystals or just uncoated parts of the same Baryte crystals? Just wanted to know if there are two generations or not ;)
Tobi
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Roger Warin
Joined: 23 Jan 2013
Posts: 1179
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Posted: May 11, 2014 16:23 Post subject: Re: The Mizunaka Collection |
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Delicate pictures for these Barytes.
Bravo.
Roger.
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 11, 2014 23:16 Post subject: Re: The Mizunaka Collection |
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Tobi - I would say that the Barytes are a single generation with the possible exception being the largest visible Baryte crystal.
Thanks Roger. This was one of the few pieces I have run across with no damage.
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Fluorite, Quartz Yaogangxian Mine, Yizhang Co., Chenzhou Prefecture, Hunan Province, China 5.0 x 2.9 cm |
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38215 Time(s) |
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Fluorite, Quartz Yaogangxian Mine, Yizhang Co., Chenzhou Prefecture, Hunan Province, China 5.0 x 2.9 cm |
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38181 Time(s) |
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Acanthite Proano Mine, Mun. de Fresnillo, Zacatecas, Mexico 4.4 x 2.2 cm |
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38564 Time(s) |
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Acanthite Proano Mine, Mun. de Fresnillo, Zacatecas, Mexico Back Side |
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38229 Time(s) |
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Acanthite Fresnillo Mine, Mun. de Fresnillo, Zacatecas, Mexico 2.7 x 1.9 cm |
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38553 Time(s) |
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Acanthite Fresnillo Mine, Mun. de Fresnillo, Zacatecas, Mexico Back Side |
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38602 Time(s) |
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Acanthite Guanajuato, Mun. de Guanajuato, Guanajuato, Mexico 4.1 x 1.8 cm |
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38589 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 12, 2014 23:25 Post subject: Re: The Mizunaka Collection |
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Description: |
Epidote, Quartz Pisco Province, Ica Department, Peru 6.5 x 1.1 cm |
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38193 Time(s) |
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Quartz Santander Department, Colombia 11.4 x 5.7 cm |
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38255 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 14, 2014 02:04 Post subject: Re: The Mizunaka Collection |
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Fluorite, Quartz Dayu Co., Ganzhou Prefecture, Jiangxi Province, China 5.4 x 3.9 x 3.2 cm |
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38156 Time(s) |
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Fluorite, Quartz Dayu Co., Ganzhou Prefecture, Jiangxi Province, China 5.4 x 3.9 x 3.2 cm |
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38537 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 14, 2014 22:44 Post subject: Re: The Mizunaka Collection |
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Quartz, Muscovite (var fuchsite) Cerro Quesgar, Ancash Department, Peru 12.6 x 11.3 cm |
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38231 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 2059
Location: USA
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Posted: May 16, 2014 01:36 Post subject: Re: The Mizunaka Collection |
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Description: |
Fluorite, Arsenopyrite Yaogangxian Mine, Yizhang Co., Chenzhou Prefecture, Hunan Province, China 4.5 x 4.0 cm |
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38101 Time(s) |
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Fluorite, Calcite, Quartz Jingbian Cu-Au deposit, Zongyang Co., Anqing Prefecture, Anhui Province, China 6.5 x 6.0 cm |
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38266 Time(s) |
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Philip Mostmans
Joined: 08 Nov 2011
Posts: 43
Location: Mechelen
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Posted: May 16, 2014 04:05 Post subject: Re: The Mizunaka Collection |
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In the third to last post you mention Dayu. Co. for both Fluorites. How sure are you about the provenance? I got a very similar piece at a show last year, labeled as Yaogangxian...
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