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Favourite Quartzes?
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Tobi




Joined: 07 Apr 2009
Posts: 2795
Location: Good Old Germany


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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:  289 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:  289 Time(s)

ZinggQ-back.JPG


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Jacqui Parsons




Joined: 16 Nov 2018
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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




Joined: 06 Nov 2015
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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:  148 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:  146 Time(s)

fullsizeoutput_2b90.jpeg


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