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am mizunaka
Joined: 09 Apr 2010
Posts: 1808
Location: USA
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 Posted: Nov 21, 2022 19:36 Post subject: The Mizunaka Collection - Smoky Quartz |
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| Mineral: | Quartz (variety smoky quartz) |
| Locality: | | Saline Valley, Inyo County, California, USA |  |
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| Dimensions: | 9.8 x 3.2 cm |
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761 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 1808
Location: USA
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| Posted: Nov 22, 2022 06:07 Post subject: The Mizunaka Collection - Calcite |
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| Mineral: | Calcite |
| Locality: | | Alzada, Carter County, Montana, USA | |
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| Dimensions: | 8.0 x 2.4 cm |
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718 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 3913
Location: Good Old Germany
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| Posted: Nov 22, 2022 08:53 Post subject: Re: The Mizunaka Collection |
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| 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
Joined: 09 Apr 2010
Posts: 1808
Location: USA
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| Posted: Nov 22, 2022 17:22 Post subject: Re: The Mizunaka Collection - Smoky Quartz |
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| 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
Site Admin
Joined: 07 Apr 2009
Posts: 3913
Location: Good Old Germany
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| Posted: Nov 23, 2022 03:58 Post subject: Re: The Mizunaka Collection - Smoky Quartz |
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| 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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am mizunaka
Joined: 09 Apr 2010
Posts: 1808
Location: USA
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| Posted: Nov 23, 2022 04:51 Post subject: The Mizunaka Collection - Rhodochrosite |
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| Mineral: | Rhodochrosite, Galena |
| Locality: | | Santa Eulalia District, Municipio Aquiles Serdán, Chihuahua, Mexico | |
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| Dimensions: | 10.5 x 6.6 cm |
| Description: |
| Rhodochrosite with some tiny galena crystals on a chunky matrixl |
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607 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 3913
Location: Good Old Germany
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| Posted: Nov 24, 2022 03:39 Post subject: Re: The Mizunaka Collection |
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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
Joined: 09 Apr 2010
Posts: 1808
Location: USA
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| Posted: Nov 24, 2022 16:59 Post subject: Re: The Mizunaka Collection - Rhodochrosite |
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| 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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am mizunaka
Joined: 09 Apr 2010
Posts: 1808
Location: USA
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| Posted: Nov 24, 2022 18:39 Post subject: The Mizunaka Collection - Eosphorite |
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| Mineral: | Eosphorite, Quartz, Zanazziite |
| Locality: | | Ilha claim, Taquaral, Itinga, Jequitinhonha, Minas Gerais, Brazil | |
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| 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. |
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415 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 1808
Location: USA
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| Posted: Nov 26, 2022 04:37 Post subject: The Mizunaka Collection - Rhodochrosite |
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| Mineral: | Rhodochrosite, Quartz |
| Locality: | | Idaho Springs, Clear Creek County, Colorado, USA | |
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| Dimensions: | 3.6 x 3.4 cm |
| Description: |
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273 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 1808
Location: USA
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| Posted: Nov 27, 2022 03:34 Post subject: The Mizunaka Collection - Quartz |
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| Mineral: | Quartz (variety smoky quartz) |
| Locality: | | Saline Valley, Inyo County, California, USA | |
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| Dimensions: | 11.5 x 3.9 cm |
| Description: |
| The slightly bigger sibling to the other Saline Valley quartz specimen. |
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132 Time(s) |
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