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Favourite Quartzes?
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Tobi




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PostPosted: Dec 05, 2018 04:18    Post subject: Re: Favourite Quartzes?  

I guess that quartzes from the Alps are favourites for many quartz collectors. I really love alpine quartzes, so this one is definitely one of my personal all-time favourites:


ZinggQ.JPG
 Mineral: Smoky Quartz
 Locality:
Zinggenstöcke, Oberaar Lake area, Grimsel area, Hasli Valley, Bern, Switzerland
 Dimensions: Height 20 cm
 Description:
 Viewed:  1352 Time(s)

ZinggQ.JPG



ZinggQ-back.JPG
 Mineral: Smoky Quartz
 Locality:
Zinggenstöcke, Oberaar Lake area, Grimsel area, Hasli Valley, Bern, Switzerland
 Dimensions: Height 20 cm
 Description:
 Viewed:  1360 Time(s)

ZinggQ-back.JPG


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Jacqui Parsons




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PostPosted: Dec 05, 2018 17:02    Post subject: Re: Favourite Quartzes?  

vic rzonca wrote:
This is from the book by Harold L. Dibble, Quartz." Cathedral Quartz. One of the most common of these types is known as Cathedral quartz. These are crystals with the axes of the secondary crystals parallel to those of the main crystal. These clusters vaguely resemble smaller spires or buttresses around the main spire of a cathedral." More of a descriptive term than a scientific one. I guess everything has to be called something.

Do you know what causes that?
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Bob Harman




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PostPosted: Dec 15, 2018 13:29    Post subject: Re: Favourite Quartzes?  

Blue quartz can be caused by any of a number of inclusions, both microscopic and macroscopic. The blue quartz might come from a wide variety of environments and worldwide localities.

These 2 examples, from an under appreciated situation, were self collected from Indiana, are of microcrystalline quartz, BLUE CHALCEDONY, and apparently derive their color from water existing in the micro spaces between the micro crystalline quartz. If kept dry, they seem to gradually pale out to very pale blue-gray over a period of years. Keeping fresh blue examples under water seems to help preserve the blue color. BOB



fullsizeoutput_2ba9.jpeg
 Mineral: Quartz (variety chalcedony)
 Locality:
Harrodsburg area, Clear Creek Township, Monroe County, Indiana, USA
 Dimensions: 11 cm x 8 cm
 Description:
Microcrystalline quartz, chalcedony, with limestone matrix
 Viewed:  1220 Time(s)

fullsizeoutput_2ba9.jpeg



fullsizeoutput_2b90.jpeg
 Mineral: Clear crystalline Quartz with microcrystalline Quartz (variety chalcedony)
 Locality:
Harrodsburg area, Clear Creek Township, Monroe County, Indiana, USA
 Dimensions: Larger half is 16 cm x 11 cm
 Description:
Photographed as part of my 2017 Cincinnati show display case. Self-collected about 6 weeks prior to the show. Kept under water since my collecting the example and the show.
 Viewed:  1218 Time(s)

fullsizeoutput_2b90.jpeg


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Bob Harman




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PostPosted: May 09, 2019 05:44    Post subject: Re: Favourite Quartzes?  

From a relatively new find, these hematite included quartz specimens are marketed by the name "red amethyst or pink amethyst". They are from a gypsum mining district in Patagonia, Argentina and first appeared on the mineral market about 2016 - 2017. The quartz varies in color from pink thru bright red to a mauve shade.

I have 3 examples, acquired at the 2018 Denver Show. My 2 larger examples have calcites atop the quartz. The photo is a close up of the examples from my display case at last week's Cincinnati mineral show.



fullsizeoutput_2ce6.jpeg
 Mineral: Hematite included quartz and calcite
 Locality:
"Choique" area, Pehuenches Department, Del Neuquén Province, Argentina
 Dimensions: Each specimen is about 11 cm max dimension
 Description:
Acquired at the 2018 Denver show, Displayed at the 2019 Cincinnati show.
 Viewed:  883 Time(s)

fullsizeoutput_2ce6.jpeg


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Tobi




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PostPosted: May 11, 2019 05:32    Post subject: Re: Favourite Quartzes?  

Bob Harman wrote:
From a relatively new find, these hematite included quartz specimens are marketed by the name "red amethyst or pink amethyst". They are from a gypsum mining district in Patagonia, Argentina and first appeared on the mineral market about 2016 - 2017. The quartz varies in color from pink thru bright red to a mauve shade.
Wow, they look great, wonderful colour!
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Tobi




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PostPosted: May 25, 2019 14:10    Post subject: Re: Favourite Quartzes?  

Though it produces masses of specimens and the stuff became quite common, Itremo/Madagascar became one of my favourite localities for quartz:


ITR-quaXL.JPG
 Mineral: Quartz
 Locality:
Itremo Massif, Itremo, Ambatofinandrahana District, Amoron'i Mania Region, Fianarantsoa Province, Madagascar
 Dimensions: Specimen size 20 cm
 Description:
 Viewed:  665 Time(s)

ITR-quaXL.JPG



Madag_QUA.JPG
 Mineral: Quartz
 Locality:
Itremo Massif, Itremo, Ambatofinandrahana District, Amoron'i Mania Region, Fianarantsoa Province, Madagascar
 Dimensions: Specimen size 17 cm
 Description:
 Viewed:  660 Time(s)

Madag_QUA.JPG



ITREcQUA.JPG
 Mineral: Quartz
 Locality:
Itremo Massif, Itremo, Ambatofinandrahana District, Amoron'i Mania Region, Fianarantsoa Province, Madagascar
 Dimensions: Specimen size 9,5 cm
 Description:
 Viewed:  659 Time(s)

ITREcQUA.JPG


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