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27 Feb-23:55:44 Isotopic composition of german silvers (Brent Lockhart)
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27 Feb-15:16:11 Appropriate photo editing software (Marvinlewinsky)
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27 Feb-13:58:29 The mizunaka collection - quartz with plancheite (Am Mizunaka)
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27 Feb-10:54:23 Re: azurite to malachite pseudomorph research (Bob Kerr)
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26 Feb-23:53:32 Re: azurite to malachite pseudomorph research (Roger Warin)
26 Feb-22:17:49 Re: taking great photographs (Bob Harman)
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26 Feb-19:35:06 Re: taking great photographs (Marvinlewinsky)
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  Topic: Quartz and Humboldtine? from Colombia
John Rakovan

Replies: 16
Views: 6101

PostForum: Minerals and Mineralogy   Posted: May 12, 2019 06:50   Subject: Re: Quartz and Humboldtine? from Colombia
Bob, here is a photo of the display at the 2019 Cincinnati Geofair
  Topic: Quartz and Humboldtine? from Colombia
John Rakovan

Replies: 16
Views: 6101

PostForum: Minerals and Mineralogy   Posted: Oct 12, 2018 09:42   Subject: Re: Quartz and Humboldtine? from Colombia
Hi Marco,

The habit of the inclusions in the Columbian quartz is distinctly different. It does not look at all vermicular as do the inclusions in your sample.

Cheers,

John

I bought this in ...
  Topic: Quartz and Humboldtine? from Colombia
John Rakovan

Replies: 16
Views: 6101

PostForum: Minerals and Mineralogy   Posted: Oct 06, 2018 14:24   Subject: Re: Quartz and Humboldtine? from Colombia
JOHN, As you know there were several of these examples in Denver. The best were VERY pricey. Are you saying there might be intentional partial cleaning of iron staining with an intention to deceive? ...
  Topic: Quartz and Humboldtine? from Colombia
John Rakovan

Replies: 16
Views: 6101

PostForum: Minerals and Mineralogy   Posted: Oct 06, 2018 07:56   Subject: Quartz and Humboldtine? from Colombia
Colorless quartz crystals that are heavily included at their terminations with a vivid yellow material have recently appeared on the specimen market ( https://www.mindat.org/photo-875255.html ). We ha ...
  Topic: Puzzled by triangular hillocks on apatite prism faces
John Rakovan

Replies: 6
Views: 5851

PostForum: Minerals and Mineralogy   Posted: May 07, 2014 10:14   Subject: Re: Puzzled by triangular hillocks on apatite prism faces
Matt,

If you are interested in diving into Hartman & Perdok theory and periodic bond chains in apatite I suggest the following papers. I tried copying both references into google and found copi ...
  Topic: Puzzled by triangular hillocks on apatite prism faces
John Rakovan

Replies: 6
Views: 5851

PostForum: Minerals and Mineralogy   Posted: May 07, 2014 06:11   Subject: Re: Puzzled by triangular hillocks on apatite prism faces
Hi Matt,

The triangular growth hillocks on the {100} crystal faces are made up of three vicinal faces with steps that are oriented in different directions, I the first chapter of Apatite-The Great ...
  Topic: Why this fluorapatite is purple?
John Rakovan

Replies: 9
Views: 8324

PostForum: Minerals and Mineralogy   Posted: Mar 25, 2014 11:28   Subject: Re: Why this fluorapatite is purple?
Dear Luis,

The rich purple of this apatite and others from locations like the Pulsifer Quarry in Maine, https://www.mindat.org/gallery.php?loc=6199&min=1572 , and Greifenstein Rocks, Ehrenfri ...
 
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