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The Mizunaka Collection
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Jim Robison




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PostPosted: May 03, 2014 19:54    Post subject: Re: The Mizunaka Collection  

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




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PostPosted: May 03, 2014 21:50    Post subject: Re: The Mizunaka Collection  

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.


SmithsoniteEdge.jpg
 Description:
Smithsonite, Quartz
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
Specimen Edge
 Viewed:  15608 Time(s)

SmithsoniteEdge.jpg



SmithsoniteSeam.jpg
 Description:
Smithsonite, Quartz
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
Seam
 Viewed:  15642 Time(s)

SmithsoniteSeam.jpg


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Jim Robison




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PostPosted: May 03, 2014 22:47    Post subject: Re: The Mizunaka Collection  

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




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PostPosted: May 04, 2014 02:24    Post subject: Re: The Mizunaka Collection  

Jim, I have not checked the hardness or tried to do an dilute HCL reaction test.
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Jim Robison




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PostPosted: May 04, 2014 21:48    Post subject: Re: The Mizunaka Collection  

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




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PostPosted: May 04, 2014 23:50    Post subject: Re: The Mizunaka Collection  

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




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PostPosted: May 07, 2014 04:16    Post subject: Re: The Mizunaka Collection  

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.


QtzGoldRutile4.jpg
 Description:
Quartz, Rutile
Hiddenite, Alexander Co., North Carolina, USA
3.9 x 2.8 cm
 Viewed:  15211 Time(s)

QtzGoldRutile4.jpg



QtzGoldRutileBk2.jpg
 Description:
Quartz, Rutile
Hiddenite, Alexander Co., North Carolina, USA
Back Side
 Viewed:  15060 Time(s)

QtzGoldRutileBk2.jpg



SmkRistEnhdro1.jpg
 Description:
Quartz (var Smoky Quartz)
Rist Mine, Hiddenite, Alexander Co., North Carolina, USA
6.5 x 3.8 cm
 Viewed:  15079 Time(s)

SmkRistEnhdro1.jpg


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am mizunaka




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PostPosted: May 08, 2014 19:11    Post subject: Re: The Mizunaka Collection  

..


BlueBarite2.jpg
 Description:
Baryte
Jebel Ouichane, Beni Bou Ifrour, Nador, Nador Province, Oriental Region, Morocco
7.8 x 7.0 cm
 Viewed:  15116 Time(s)

BlueBarite2.jpg



BlueBarite1.jpg
 Description:
Baryte
Jebel Ouichane, Beni Bou Ifrour, Nador, Nador Province, Oriental Region, Morocco
7.8 x 7.0 cm
 Viewed:  15105 Time(s)

BlueBarite1.jpg



KongsbergSilver.jpg
 Description:
Silver
Kongsberg, Buskerud, Norway
3.5 x 4.5 cm
 Viewed:  15069 Time(s)

KongsbergSilver.jpg


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Mike Wood




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PostPosted: May 09, 2014 14:30    Post subject: Re: The Mizunaka Collection  

Lovely quartzes from Rist Mine, Mike. The blue Baryte specimen from Morrocco looks mouthwateringly good, and excellent contrast with the matrix!

Thanks, Mike

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am mizunaka




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PostPosted: May 10, 2014 01:39    Post subject: Re: The Mizunaka Collection  

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.


QtzBarite.jpg
 Description:
Baryte, Quartz
Jinkouhe District, Leshan Prefecture, Sichuan Province, China
9.7 x 8.3 cm
 Viewed:  14931 Time(s)

QtzBarite.jpg


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Tobi




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PostPosted: May 10, 2014 02:30    Post subject: Re: The Mizunaka Collection  

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




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PostPosted: May 10, 2014 17:38    Post subject: Re: The Mizunaka Collection  

Tobi, I think that the white coating is a fine layer of quartz.
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Tobi




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PostPosted: May 11, 2014 01:22    Post subject: Re: The Mizunaka Collection  

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




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PostPosted: May 11, 2014 16:23    Post subject: Re: The Mizunaka Collection  

Delicate pictures for these Barytes.
Bravo.
Roger.
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am mizunaka




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PostPosted: May 11, 2014 23:16    Post subject: Re: The Mizunaka Collection  

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.



QtzFluoriteSp1.jpg
 Description:
Fluorite, Quartz
Yaogangxian Mine, Yizhang Co., Chenzhou Prefecture, Hunan Province, China
5.0 x 2.9 cm
 Viewed:  14586 Time(s)

QtzFluoriteSp1.jpg



QtzFluoriteSp.jpg
 Description:
Fluorite, Quartz
Yaogangxian Mine, Yizhang Co., Chenzhou Prefecture, Hunan Province, China
5.0 x 2.9 cm
 Viewed:  14574 Time(s)

QtzFluoriteSp.jpg



Acanthite.jpg
 Description:
Acanthite
Proano Mine, Mun. de Fresnillo, Zacatecas, Mexico
4.4 x 2.2 cm
 Viewed:  14681 Time(s)

Acanthite.jpg



AcanthiteBk1.jpg
 Description:
Acanthite
Proano Mine, Mun. de Fresnillo, Zacatecas, Mexico
Back Side
 Viewed:  14615 Time(s)

AcanthiteBk1.jpg



AcanFloater.jpg
 Description:
Acanthite
Fresnillo Mine, Mun. de Fresnillo, Zacatecas, Mexico
2.7 x 1.9 cm
 Viewed:  14693 Time(s)

AcanFloater.jpg



AcanFloaterBk.jpg
 Description:
Acanthite
Fresnillo Mine, Mun. de Fresnillo, Zacatecas, Mexico
Back Side
 Viewed:  14714 Time(s)

AcanFloaterBk.jpg



AcanPseudo1.jpg
 Description:
Acanthite
Guanajuato, Mun. de Guanajuato, Guanajuato, Mexico
4.1 x 1.8 cm
 Viewed:  14727 Time(s)

AcanPseudo1.jpg


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am mizunaka




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PostPosted: May 12, 2014 23:25    Post subject: Re: The Mizunaka Collection  




DTQtzEpidoteLg1.jpg
 Description:
Epidote, Quartz
Pisco Province, Ica Department, Peru
6.5 x 1.1 cm
 Viewed:  14550 Time(s)

DTQtzEpidoteLg1.jpg



QtzSA1.jpg
 Description:
Quartz
Santander Department, Colombia
11.4 x 5.7 cm
 Viewed:  14554 Time(s)

QtzSA1.jpg


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am mizunaka




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PostPosted: May 14, 2014 02:04    Post subject: Re: The Mizunaka Collection  




FluoriteQtzZone.jpg
 Description:
Fluorite, Quartz
Dayu Co., Ganzhou Prefecture, Jiangxi Province, China
5.4 x 3.9 x 3.2 cm
 Viewed:  14477 Time(s)

FluoriteQtzZone.jpg



FluoriteQtzZone1.jpg
 Description:
Fluorite, Quartz
Dayu Co., Ganzhou Prefecture, Jiangxi Province, China
5.4 x 3.9 x 3.2 cm
 Viewed:  14574 Time(s)

FluoriteQtzZone1.jpg


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am mizunaka




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PostPosted: May 14, 2014 22:44    Post subject: Re: The Mizunaka Collection  

..


QtzFuchite.jpg
 Description:
Quartz, Muscovite (var fuchsite)
Cerro Quesgar, Ancash Department, Peru
12.6 x 11.3 cm
 Viewed:  14392 Time(s)

QtzFuchite.jpg


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am mizunaka




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PostPosted: May 16, 2014 01:36    Post subject: Re: The Mizunaka Collection  




FluoriteArseno.jpg
 Description:
Fluorite, Arsenopyrite
Yaogangxian Mine, Yizhang Co., Chenzhou Prefecture, Hunan Province, China
4.5 x 4.0 cm
 Viewed:  14277 Time(s)

FluoriteArseno.jpg



FluoriteQtzCalcLg.jpg
 Description:
Fluorite, Calcite, Quartz
Jingbian Cu-Au deposit, Zongyang Co., Anqing Prefecture, Anhui Province, China
6.5 x 6.0 cm
 Viewed:  14299 Time(s)

FluoriteQtzCalcLg.jpg


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Philip Mostmans




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PostPosted: May 16, 2014 04:05    Post subject: Re: The Mizunaka Collection  

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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