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29 Jun-22:23:47 Re: the mizunaka collection - calcite (Am Mizunaka)
29 Jun-13:51:52 Schorl - silvia's collection (Silvia)
29 Jun-13:46:28 Re: the mizunaka collection - calcite (Silvia)
29 Jun-08:43:48 Re: red fluorescence in fluorite (Bob Carnein)
29 Jun-00:30:37 Re: the mizunaka collection - calcite (Am Mizunaka)
28 Jun-22:32:49 Re: the mizunaka collection (Roger Warin)
28 Jun-21:23:29 The mizunaka collection - calcite (Am Mizunaka)
28 Jun-17:51:25 Re: red fluorescence in fluorite (Josele)
28 Jun-15:41:11 Re: backlighting specimens (Firmo Espinar)
28 Jun-15:11:34 Re: backlighting specimens (Firmo Espinar)
28 Jun-08:55:58 Re: backlighting specimens (James Catmur)
28 Jun-08:48:12 Re: backlighting specimens (Firmo Espinar)
28 Jun-06:09:28 Sainte-marie-aux-mines 2022 - an exceptional edition (Jordi Fabre)
28 Jun-03:13:43 Re: quartz confusion (Duncan Miller)
27 Jun-15:03:22 Re: quartz confusion (Peter Megaw)
27 Jun-13:54:09 Quartz confusion (Nirvash Heera)
27 Jun-13:01:43 Re: collection of michael shaw (Michael Shaw)
27 Jun-10:38:37 Re: red fluorescence in fluorite (Bob Carnein)
27 Jun-07:43:48 Re: unknown garnet (Roger Warin)
27 Jun-03:54:07 Re: red fluorescence in fluorite (James Catmur)
26 Jun-20:00:13 Re: unknown garnet (Matt_zukowski)
26 Jun-17:58:07 Re: red fluorescence in fluorite (Bob Carnein)
26 Jun-17:50:27 Re: unknown garnet (Bob Carnein)
26 Jun-14:53:06 Re: unknown garnet (Riccardo Modanesi)
26 Jun-14:06:50 Re: red fluorescence in fluorite (James Catmur)

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  Topic: Red fluorescence in Fluorite
Bob Carnein

Replies: 13
Views: 6023

PostForum: Minerals and Mineralogy   Posted: Jun 29, 2022 08:43   Subject: Re: Red fluorescence in Fluorite
I agree that this Pakistani fluorite is pretty impressive. However, there is a downside. After I bought it, I saw a specimen for sale on Etsy suggesting it was heat treated. I wondered whether anyo ...
  Topic: Red fluorescence in Fluorite
Bob Carnein

Replies: 13
Views: 6023

PostForum: Minerals and Mineralogy   Posted: Jun 27, 2022 10:38   Subject: Re: Red fluorescence in Fluorite
My apologies--I was in a hurry and didn't notice you were responding to a different post.
  Topic: Red fluorescence in Fluorite
Bob Carnein

Replies: 13
Views: 6023

PostForum: Minerals and Mineralogy   Posted: Jun 26, 2022 17:58   Subject: Re: Red fluorescence in Fluorite
Hi, James, I bought it directly from a Pakistani dealer, so it seems unlikely that they imported it and then sold it as local. But, of course, odd things happen??
  Topic: Unknown garnet
Bob Carnein

Replies: 7
Views: 581

PostForum: What is it? - Where is it from?   Posted: Jun 26, 2022 17:50   Subject: Re: Unknown garnet
I don't know whether uvarovite, a garnet with a very restricted geologic provenance, occurs in Pakistan, but there are no photos of it on Mindat.
  Topic: Red fluorescence in Fluorite
Bob Carnein

Replies: 13
Views: 6023

PostForum: Minerals and Mineralogy   Posted: Jun 26, 2022 11:22   Subject: Re: Red fluorescence in Fluorite
Here is a red-fluorescing fluorite that I recently purchased from a dealer in Pakistan. It is described as coming from the Kharan District, Balochistan, Pakistan.
  Topic: Unknown garnet
Bob Carnein

Replies: 7
Views: 581

PostForum: What is it? - Where is it from?   Posted: Jun 25, 2022 09:27   Subject: Re: Unknown garnet
Could be demantoid (andradite). Mindat lists several localities in Pakistan.
  Topic: Crystallography question
Bob Carnein

Replies: 6
Views: 495

PostForum: Minerals and Mineralogy   Posted: Jun 17, 2022 14:53   Subject: Re: Crystallography question
I just looked at the hambergite crystal again and did a little digging. I believe the "composition plane" may be parallel to the cleavage, but I'm not sure that makes sense,. The big faces ...
  Topic: Crystallography question
Bob Carnein

Replies: 6
Views: 495

PostForum: Minerals and Mineralogy   Posted: Jun 17, 2022 11:58   Subject: Re: Crystallography question
Thanks to Johan, Pete, and Bob M. for your comments.

Attached are several additional photos of the hambergite. The first is looking down from "above", i.e. looking down the long axis a ...
  Topic: Crystallography question
Bob Carnein

Replies: 6
Views: 495

PostForum: Minerals and Mineralogy   Posted: Jun 16, 2022 12:48   Subject: Crystallography question
Here's a challenge (?) for the crystallography folks. I recently bought this specimen of hambergite from Stak Nala, Baltistan, Pakistan. The crystal is 3.4 cm long, and, although it looks like it's ...
  Topic: Possible high grade Osmiridium ore sample?
Bob Carnein

Replies: 14
Views: 1023

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jun 07, 2022 19:17   Subject: Re: Possible high grade Osmiridium ore sample?
I'm suggesting XRD, not XRF. XRD identifies specific minerals rather than chemical constituents.
  Topic: Possible high grade Osmiridium ore sample?
Bob Carnein

Replies: 14
Views: 1023

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jun 07, 2022 19:07   Subject: Re: Possible high grade Osmiridium ore sample?
Hi, Laurent, A number of mineral dealers do X-ray diffraction testing for a fee that isn't too expensive (I don't think this Forum is a place for me to list examples, but if you PM me, I can make one ...
  Topic: Is this a ruby?
Bob Carnein

Replies: 12
Views: 939

PostForum: What is it? - Where is it from?   Posted: May 08, 2022 18:08   Subject: Re: Is this a ruby?
I agree with Bob. The diagonal cracks are most likely rhombohedral parting, which is typical of corundum. Whether you would call this ruby is another issue entirely.
  Topic: Novice questions!
Bob Carnein

Replies: 6
Views: 776

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 04, 2022 09:42   Subject: Re: Novice questions!
Besides what others recommended, I would never go out in the field without a good hand lens. For years, I have used a 10X B&L Coddington magnifier, though some swear by more powerful lenses. The ...
  Topic: Elbaite, ending moor's head
Bob Carnein

Replies: 9
Views: 1135

PostForum: Minerals and Mineralogy   Posted: Apr 19, 2022 16:22   Subject: Re: Elbaite, ending moor's head
John, I get that, but it doesn't explain why growth seems to be upward (or downward) toward the termination rather than outward, as in a phantom quartz xl. If growth was outward, one would expect to ...
  Topic: Elbaite, ending moor's head
Bob Carnein

Replies: 9
Views: 1135

PostForum: Minerals and Mineralogy   Posted: Apr 19, 2022 09:33   Subject: Re: Elbaite, ending moor's head
This question brings up another, which is why do tourmaline crystals often vary in color along their lengths? One normally thinks that crystals grow outward from a "seed", which explains ph ...
  Topic: Black Tourmaline Rookie pics
Bob Carnein

Replies: 7
Views: 1185

PostForum: Micros & Macros - Images of Minerals   Posted: Apr 12, 2022 20:34   Subject: Re: Black Tourmaline Rookie pics
Not bad pictures for a rookie...
  Topic: Help identify
Bob Carnein

Replies: 1
Views: 459

PostForum: What is it? - Where is it from?   Posted: Apr 03, 2022 15:14   Subject: Re: Help identify
This appears to be a "coal ball", which is a mineralized concretion from a coal seam. They are usually calcareous and sometimes contain well preserved fossil plants.
  Topic: What is the correct name for this rock?
Bob Carnein

Replies: 6
Views: 827

PostForum: What is it? - Where is it from?   Posted: Mar 29, 2022 10:46   Subject: Re: What is the correct name for this rock?
I'd call it a welded crystal-vitric tuff--essentially what Matt said.
  Topic: Unusual habit for Pyrite.
Bob Carnein

Replies: 28
Views: 2980

PostForum: Minerals and Mineralogy   Posted: Mar 25, 2022 11:00   Subject: Re: Unusual habit for Pyrite.
I understand your interest in pyrite, but I think this is a really cool chalcopyrite crystal that would be a proud addition to many collections--it certainly caused a lot of discussion on the forum.
  Topic: Unusual habit for Pyrite.
Bob Carnein

Replies: 28
Views: 2980

PostForum: Minerals and Mineralogy   Posted: Mar 23, 2022 17:46   Subject: Re: Unusual habit for Pyrite.
There's an even better photo on Mindat: It's by Karl Volkman and it's from the Yaogangxian mine, Hunan (Mindat ID64V-CHY). It definitely shows the striation pattern shown by your specimen.
 
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