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27 Nov-17:43:53 Re: don lum collection (Don Lum)
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27 Nov-14:37:49 Re: how hard is it to find a new mineral species? (Roger Warin)
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27 Nov-03:34:09 The mizunaka collection - quartz (Am Mizunaka)
27 Nov-01:38:48 Re: minerals to be found in only one location (Peter Lemkin)
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26 Nov-20:09:39 Re: minerals to be found in only one location (David)
26 Nov-19:59:36 Re: minerals to be found in only one location (David)
26 Nov-17:11:43 Re: how hard is it to find a new mineral species? (Jordi Fabre)
26 Nov-16:22:43 Re: minerals to be found in only one location (Romain M)
26 Nov-16:04:31 Minerals to be found in only one location (David)
26 Nov-15:28:25 Re: how hard is it to find a new mineral species? (David)
26 Nov-15:16:40 Re: how hard is it to find a new mineral species? (David)
26 Nov-10:15:40 Re: collection of volkmar stingl (Volkmar Stingl)
26 Nov-04:37:05 The mizunaka collection - rhodochrosite (Am Mizunaka)
25 Nov-09:44:09 Re: collection of michael shaw (Michael Shaw)
24 Nov-18:39:08 The mizunaka collection - eosphorite (Am Mizunaka)
24 Nov-16:59:55 Re: the mizunaka collection - rhodochrosite (Am Mizunaka)
24 Nov-16:16:01 Re: collection of firmo espinar (Firmo Espinar)
24 Nov-03:39:41 Re: the mizunaka collection (Tobi)
23 Nov-15:32:20 Re: a new mineral species: pendevilleite (Roger Warin)
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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:  755 Time(s)

SalineSmkQtz.jpg


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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:  712 Time(s)

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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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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:  601 Time(s)

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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:  409 Time(s)

QtzEosBr.jpg


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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:  267 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:  126 Time(s)

SalineSmkQtz2.jpg


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