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08 Dec-04:56:42 The mizunaka collection - quartz (Am Mizunaka)
06 Dec-22:41:50 Re: collection of volkmar stingl (Volkmar Stingl)
06 Dec-12:44:03 Re: collection of michael shaw (Michael Shaw)
06 Dec-01:43:16 Re: favourite mineral species/families? (Roger Warin)
05 Dec-10:05:40 Re: don lum collection (Don Lum)
05 Dec-08:40:26 Re: collection of firmo espinar (Firmo Espinar)
05 Dec-04:05:01 The mizunaka collection - smoky quartz (Am Mizunaka)
05 Dec-03:01:11 Re: don lum collection (Tobi)
04 Dec-17:14:12 Re: don lum collection (Don Lum)
04 Dec-12:01:14 Re: favourite mineral species/families? (Philippe Durand)
04 Dec-11:41:53 Re: favourite mineral species/families? (Bob Kerr)
04 Dec-11:05:35 Re: favourite mineral species/families? (Michael Shaw)
04 Dec-11:02:16 Re: collection of michael shaw (Michael Shaw)
04 Dec-03:42:22 Re: favourite mineral species/families? (Tobi)
04 Dec-01:01:59 Re: collection of volkmar stingl (Volkmar Stingl)
03 Dec-20:39:46 Re: help with locality (Michael Shaw)
03 Dec-17:37:31 The mizunaka collection - rhodochrosite (Am Mizunaka)
03 Dec-16:29:57 Re: help with locality (Bob Kerr)
03 Dec-16:12:41 Help with locality (Michael Shaw)
03 Dec-10:13:33 Re: collection of tobi (Tobi)
03 Dec-09:09:28 Re: collection of tobi (Tobi)
02 Dec-16:26:37 Re: new generation for picture - ploum (Ploum)
02 Dec-10:20:36 Re: collection of xiao-dong (James Catmur)
02 Dec-09:44:52 Re: collection of michael shaw (Michael Shaw)
02 Dec-09:18:51 Re: collection of xiao-dong (Xdxucn)

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The Mizunaka Collection
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am mizunaka




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PostPosted: Nov 21, 2022 19:36    Post subject: The Mizunaka Collection - Smoky Quartz  




SalineSmkQtz.jpg
 Mineral: Quartz (variety smoky quartz)
 Locality:
Saline Valley, Inyo County, California, USA
 Dimensions: 9.8 x 3.2 cm
 Description:
 Viewed:  1630 Time(s)

SalineSmkQtz.jpg


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am mizunaka




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PostPosted: Nov 22, 2022 06:07    Post subject: The Mizunaka Collection - Calcite  




CalFinger.jpg
 Mineral: Calcite
 Locality:
Alzada, Carter County, Montana, USA
 Dimensions: 8.0 x 2.4 cm
 Description:
 Viewed:  1588 Time(s)

CalFinger.jpg


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Tobi
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PostPosted: Nov 22, 2022 08:53    Post subject: Re: The Mizunaka Collection  

I really like that smoky quartz from Saline Valley. It has an alpine character, a spectacular shape and quality and seems to be very clear. A very choice quartz crystal from a locality that produced not many specimens, I guess?
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am mizunaka




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PostPosted: Nov 22, 2022 17:22    Post subject: Re: The Mizunaka Collection - Smoky Quartz  

Tobi wrote:
I really like that smoky quartz from Saline Valley. It has an alpine character, a spectacular shape and quality and seems to be very clear. A very choice quartz crystal from a locality that produced not many specimens, I guess?


Thanks Tobi! I am not sure on how productive this locality was/is. I have not seen many come to market over the years. The ones I have seen do have that alpine quality/look to them. This one is very clear and glassy.
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Tobi
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PostPosted: Nov 23, 2022 03:58    Post subject: Re: The Mizunaka Collection - Smoky Quartz  

am mizunaka wrote:
I have not seen many come to market over the years.
I think I have never seen one for sale from a European dealer, so it seems to be rather rare stuff.
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PostPosted: Nov 23, 2022 04:51    Post subject: The Mizunaka Collection - Rhodochrosite  




RhodoGalSE.jpg
 Mineral: Rhodochrosite, Galena
 Locality:
Santa Eulalia District, Municipio Aquiles Serdán, Chihuahua, Mexico
 Dimensions: 10.5 x 6.6 cm
 Description:
Rhodochrosite with some tiny galena crystals on a chunky matrixl
 Viewed:  1480 Time(s)

RhodoGalSE.jpg


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Tobi
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PostPosted: Nov 24, 2022 03:39    Post subject: Re: The Mizunaka Collection  

A fascinating feature of that specimen is that there seem to be two different colours of the rhodo, some pink and some red. Any idea how this really different two colours on one specimen developed? Maybe two generations of MnCO₃ with different formation conditions? I don't know much about the chemistry of minerals but I once learned that the different colours of rhodochrosite depend on the temperature during growth and the composition of the elements and "impurities" (Mn, Fe, Ca, Mg). But such differences on one specimen are for sure something rare.

Very interesting piece, Mike, thanks for sharing!
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am mizunaka




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PostPosted: Nov 24, 2022 16:59    Post subject: Re: The Mizunaka Collection - Rhodochrosite  

Tobi wrote:
A fascinating feature of that specimen is that there seem to be two different colours of the rhodo, some pink and some red. Any idea how this really different two colours on one specimen developed? Maybe two generations of rhodochrosite with different formation conditions? I don't know much about the chemistry of minerals but I once learned that the different colours of rhodochrosite depend on the temperature during growth and the composition of the elements and "impurities" (Mn, Fe, Ca, Mg). But such differences on one specimen are for sure something rare.

Very interesting piece, Mike, thanks for sharing!


I am not an expert in mineral chemistry or geology as well. Maybe since the crystals formed in two voids that each cavity had very different environments that lead to the two distinct colors/forms of rhodochrosite.

As a side note the chemical formula you used for rhodochrosite was flagged as spam. I had to replace it with the mineral name.
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PostPosted: Nov 24, 2022 18:39    Post subject: The Mizunaka Collection - Eosphorite  




QtzEosBr.jpg
 Mineral: Eosphorite, Quartz, Zanazziite
 Locality:
Ilha claim, Taquaral, Itinga, Jequitinhonha, Minas Gerais, Brazil
 Dimensions: 6.9 x 5.1 x 1.6 cm
 Description:
Eosphorite cluster on a thin quartz crystal with some scattered bits of pale greenish zanazziite.
 Viewed:  1281 Time(s)

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PostPosted: Nov 26, 2022 04:37    Post subject: The Mizunaka Collection - Rhodochrosite  




RhodoIdahoSp.jpg
 Mineral: Rhodochrosite, Quartz
 Locality:
Idaho Springs, Clear Creek County, Colorado, USA
 Dimensions: 3.6 x 3.4 cm
 Description:
 Viewed:  1143 Time(s)

RhodoIdahoSp.jpg


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PostPosted: Nov 27, 2022 03:34    Post subject: The Mizunaka Collection - Quartz  




SalineSmkQtz2.jpg
 Mineral: Quartz (variety smoky quartz)
 Locality:
Saline Valley, Inyo County, California, USA
 Dimensions: 11.5 x 3.9 cm
 Description:
The slightly bigger sibling to the other Saline Valley quartz specimen.
 Viewed:  1003 Time(s)

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PostPosted: Nov 28, 2022 06:48    Post subject: The Mizunaka Collection - Smoky Quartz  




SmkQtzCalPyRist.jpg
 Mineral: Quartz (variety smoky quartz), Calcite, Pyrite, Muscovite
 Locality:
Rist Mine, Hiddenite, Alexander County, North Carolina, USA
 Dimensions: 9.9 x 7.8 cm
 Description:
Smoky quartz with a slight hint of purple color in the scepter. Small calcites and scattered bits of pyrite inclusions. Blades of muscovite are on the back of the specimen.
 Viewed:  861 Time(s)

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PostPosted: Nov 29, 2022 03:04    Post subject: The Mizunaka Collection - Copper  




CopperCob.jpg
 Mineral: Copper
 Locality:
Santa Clara del Cobre, Salvador Escalante Municipality, Michoacan, Mexico
 Dimensions: 6.9 x 6.0 cm
 Description:
 Viewed:  759 Time(s)

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James Catmur
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PostPosted: Nov 29, 2022 05:07    Post subject: Re: The Mizunaka Collection  

I have never seen specimens from Santa Clara del Cobre, although I have copper vessels from there (we visited the area in the 1970s and 80s)
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PostPosted: Nov 30, 2022 01:45    Post subject: The Mizunaka Collection - Calcite  




CalciteDG.jpg
 Mineral: Calcite
 Locality:
Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai, Russia
 Dimensions: 4.3 x 4.1 cm
 Description:
Not sure if the calcite is heavily included with some mineral or has been completely replaced by it.
 Viewed:  603 Time(s)

CalciteDG.jpg


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PostPosted: Dec 01, 2022 18:55    Post subject: The Mizunaka Collection - Petrified Wood  

...


QtzPetBrill.jpg
 Mineral: Quartz (variety smoky quartz), Petrified Wood
 Locality:
Brilliant, Marion County, Alabama, USA
 Dimensions: 13.0 x 7.8 cm
 Description:
Pockets of smoky quartz on petrified wood.
 Viewed:  473 Time(s)

QtzPetBrill.jpg



QtzPetBrillBk.jpg
 Mineral: Quartz (variety smoky quartz), Petrified Wood
 Locality:
Brilliant, Marion County, Alabama, USA
 Dimensions: 13.0 x 7.8 cm
 Description:
Back of specimen.
 Viewed:  474 Time(s)

QtzPetBrillBk.jpg


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PostPosted: Dec 02, 2022 05:29    Post subject: The Mizunaka Collection - Quartz  

...


QtzShinSpr.jpg
 Mineral: Quartz with Chlorite
 Locality:
Shingle Springs, Shingle Springs District, El Dorado County, California, USA
 Dimensions: 9.6 x 9.3 cm
 Description:
Updated/Improved photo of an older specimen.
Chlorite is present as inclusions.
 Viewed:  423 Time(s)

QtzShinSpr.jpg


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PostPosted: Dec 03, 2022 17:37    Post subject: The Mizunaka Collection - Rhodochrosite  




RhodoSantaE.jpg
 Mineral: Rhodochrosite
 Locality:
Potosí Mine, level 10, Santo Domingo (Francisco Portillo), Santa Eulalia District, Municipio Aquiles Serdán, Chihuahua, Mexico
 Dimensions: 9.2 x 6.6 cm
 Description:
 Viewed:  328 Time(s)

RhodoSantaE.jpg


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PostPosted: Dec 05, 2022 04:05    Post subject: The Mizunaka Collection - Smoky Quartz  

...


SmkQtzOban1.jpg
 Mineral: Quartz (variety smoky quartz)
 Locality:
Oban River, Oban, Clarke County, New South Wales, Australia
 Dimensions: 11.4 x 5.4 cm
 Description:
 Viewed:  176 Time(s)

SmkQtzOban1.jpg


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PostPosted: Dec 08, 2022 04:56    Post subject: The Mizunaka Collection - Quartz  




QtzEnigma.jpg
 Mineral: Quartz
 Locality:
Hiddenite, Alexander County, North Carolina, USA
 Dimensions: 12.0 x 14.0 cm
 Description:
Glassy quartz cluster with inclusions. Crystallized all the way around the specimen.
 Viewed:  3 Time(s)

QtzEnigma.jpg


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