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Newest topics and users posts
18 Jan-18:36:38 The mizunaka collection - smoky quartz (Am Mizunaka)
18 Jan-17:35:15 Re: don lum collection (Don Lum)
18 Jan-11:27:14 Re: collection of ras (Robert Seitz)
18 Jan-09:50:00 Re: collection of michael shaw - ilvaite (Michael Shaw)
18 Jan-04:29:58 Re: collection of ras (Tobi)
17 Jan-22:53:41 Re: silvia's collection (Silvia)
17 Jan-22:42:23 The mizunaka collection - quartz (Am Mizunaka)
17 Jan-12:30:52 Re: collection of ras (Robert Seitz)
17 Jan-05:34:24 Re: collection of firmo espinar (Tobi)
17 Jan-04:08:41 Re: collection of sante celiberti (Tobi)
17 Jan-04:02:37 Re: silvia's collection (Tobi)
17 Jan-03:52:12 Re: tucson shows 2022 (Tobi)
16 Jan-08:33:31 Re: apophyllite from brazil - a new find from 2021? (Gagat Minerals)
15 Jan-22:46:01 Re: tucson shows 2022 - it's starting!! (Alfredo)
15 Jan-22:29:08 Re: tucson shows 2022 - it's starting!! (Bob Harman)
15 Jan-22:23:43 Re: apophyllite from brazil - a new find from 2021? (Alfredo)
15 Jan-22:19:22 The mizunaka collection - thin quartz (Am Mizunaka)
15 Jan-19:31:17 Apophyllite from brazil - a new find from 2021? (Gagat Minerals)
15 Jan-18:40:57 Re: alleged 'silvers' from udokan? (Bob Harman)
15 Jan-17:48:47 Tucson shows 2022 (Bob Kerr)
15 Jan-17:32:21 Re: alleged 'silvers' from udokan? (Alfredo)
15 Jan-16:52:31 Re: alleged 'silvers' from udokan? (Bob Harman)
15 Jan-16:23:26 Re: collection of michael shaw (Michael Shaw)
15 Jan-16:21:55 Chalcostibite - silvia's collection (Silvia)
15 Jan-14:22:05 Re: collection of sante celiberti (Sante Celiberti)

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  Topic: Seeking methodology for identifying crystalline forms.
Bob Carnein

Replies: 11
Views: 701

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 04, 2022 12:02   Subject: Re: Seeking methodology for identifying crystalline forms.
Pete, Maybe I'm quibbling or misunderstood your post, but isometric crystals often have 3 2-fold rotational axes, rather than 4-fold (some may be 4-fold rotary inversion axes, but that's beyond most b ...
  Topic: Seeking methodology for identifying crystalline forms.
Bob Carnein

Replies: 11
Views: 701

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 03, 2022 18:38   Subject: Re: Seeking methodology for identifying crystalline forms.
Angell, For many collectors, crystallography is a frustrating subject. If you're serious, don't rely on online simplifications; some of them are awful, and it isn't easy for the beginner to know the ...
  Topic: Merry Christmas and Happy New Year 2022!
Bob Carnein

Replies: 18
Views: 1254

PostForum: Comments & Suggestions   Posted: Dec 23, 2021 16:58   Subject: Re: Merry Christmas and Happy New Year 2022!
Pete, I just purchased one of these "winged" apatites, and I am very curious to hear what you come up with, with regard to their habit. I had never seen anything like them.

Happy Holiday ...
  Topic: May I get a read
Bob Carnein

Replies: 4
Views: 831

PostForum: What is it? - Where is it from?   Posted: Dec 01, 2021 10:19   Subject: Re: May I get a read
May I ask how you measured SG and hardness? It looks to me like quartz.
  Topic: Mystery Hopper Octahedral Pseudomorph
Bob Carnein

Replies: 1
Views: 774

PostForum: What is it? - Where is it from?   Posted: Nov 03, 2021 15:37   Subject: Re: Mystery Hopper Octahedral Pseudomorph
Did your neighbor travel to Africa? Maybe northupite from Lake Katwe, Uganda??
  Topic: Minerals and mysteries from a college collection
Bob Carnein

Replies: 8
Views: 1690

PostForum: What is it? - Where is it from?   Posted: Oct 19, 2021 20:08   Subject: Re: Minerals and mysteries from a college collection
I'm seeing some iridescence in the freshly broken half. Do you have any information on the streak, hardness, SG? It looks somewhat like the marcasite concretions that sometimes contain pyritized fos ...
  Topic: Minerals and mysteries from a college collection
Bob Carnein

Replies: 8
Views: 1690

PostForum: What is it? - Where is it from?   Posted: Oct 19, 2021 20:05   Subject: Re: Minerals and mysteries from a college collection
It may be bloedite (whitish) with krohnkite (blue).
  Topic: The Tobi Martin Mineral Collection - (38)
Bob Carnein

Replies: 20
Views: 4219

PostForum: Featured Columns of FMF   Posted: Oct 10, 2021 16:35   Subject: Re: The Tobi Martin Mineral Collection - (38)
Nice post, Tobi. You're lucky that you can still return to the Marburg museum. My first experience with a museum collection was at the Academy of Natural Sciences, in Philadelphia, PA. Alas, Philis ...
  Topic: About calaverite from Creeple Creek
Bob Carnein

Replies: 2
Views: 1210

PostForum: Minerals and Mineralogy   Posted: Oct 03, 2021 09:42   Subject: Re: About calaverite from Creeple Creek
Your calaverite appears to be coated with chalcedony, which is pretty common at Cripple Creek/Victor. For me, the photo isn't clear enough to show alteration to gold.
  Topic: Conditions where pyrite/pyritohedra are formed
Bob Carnein

Replies: 16
Views: 3436

PostForum: Minerals and Mineralogy   Posted: Oct 01, 2021 17:40   Subject: Re: Conditions where pyrite/pyritohedra are formed
Some people at Penn State did experimental work on environment and pyrite habit. I don't know that it helps with the varied habits in a small area, but here's a reference:

Murowchick, J., and H.L. ...
  Topic: Question about an old specimen
Bob Carnein

Replies: 8
Views: 1698

PostForum: What is it? - Where is it from?   Posted: Sep 27, 2021 09:39   Subject: Re: Question about an old specimen
Thanks for all of the suggestions. I forgot to mention that the crystals are somewhat magnetic (with an ordinary magnet). The specimen I saw at Denver was so expensive that I didn't want to try any ...
  Topic: Question about an old specimen
Bob Carnein

Replies: 8
Views: 1698

PostForum: What is it? - Where is it from?   Posted: Sep 26, 2021 16:54   Subject: Question about an old specimen
The specimen shown in the photos has been in my collection for over 40 years. It came from a collection that, unfortunately, had become pretty badly mixed up. The label that came with it called it & ...
  Topic: what rock/mineral is this? (2)
Bob Carnein

Replies: 6
Views: 1304

PostForum: What is it? - Where is it from?   Posted: Aug 28, 2021 14:27   Subject: Re: what rock/mineral is this? (2)
This appears to be a specimen of baryte (cream colored) and vanadinite (dark rust-red colored) from Mibladen, Morocco. The little crystals on the back might be pyromorphite; they're a little blurry.
  Topic: Probable ruby/garnet mix?
Bob Carnein

Replies: 7
Views: 1343

PostForum: What is it? - Where is it from?   Posted: Aug 27, 2021 09:56   Subject: Re: Probable ruby/garnet mix?
That's true, of course, and it illustrates why this kind of discussion isn't very useful without more information.
  Topic: Probable ruby/garnet mix?
Bob Carnein

Replies: 7
Views: 1343

PostForum: What is it? - Where is it from?   Posted: Aug 26, 2021 15:07   Subject: Re: Probable ruby/garnet mix?
I agree with Joseph. Apparently, the garnet (?) is partly surrounded by light colored material that is fluorescing, and that could be microcline.
  Topic: Corundum Conundrum...is it ruby?
Bob Carnein

Replies: 3
Views: 1013

PostForum: What is it? - Where is it from?   Posted: Aug 22, 2021 17:55   Subject: Re: Corundum Conundrum...is it ruby?
Can you give us any information about its hardness? Locality? Is the last photo just a strong light, or is it a LWUV (it looks like it might be a Convoy)? If not, does it fluoresce?
  Topic: 15 years since the beginning of FMF. As time goes!
Bob Carnein

Replies: 19
Views: 4350

PostForum: Comments & Suggestions   Posted: Aug 07, 2021 15:57   Subject: Re: 15 years since the beginning of FMF. As time goes!
Thanks for providing us all with an interesting and thought-provoking forum!
  Topic: Black, metallic, yellow oxide?
Bob Carnein

Replies: 24
Views: 4242

PostForum: What is it? - Where is it from?   Posted: Jul 23, 2021 18:40   Subject: Re: Black, metallic, yellow oxide?
This is a great find of a classic pseudomorph! Congratulations.
  Topic: Unknown mineral from Pikes Peak pegmatite
Bob Carnein

Replies: 23
Views: 4443

PostForum: What is it? - Where is it from?   Posted: Jul 22, 2021 09:56   Subject: Re: Unknown mineral from Pikes Peak pegmatite
I was able to break this crystal into two fragments, preserving the termination. I sent the bottom half to John Attard, who completed an XRD analysis (attached), which indicates that it's quartz. No ...
  Topic: Black, metallic, yellow oxide?
Bob Carnein

Replies: 24
Views: 4242

PostForum: What is it? - Where is it from?   Posted: Jul 21, 2021 19:55   Subject: Re: Black, metallic, yellow oxide?
How about sphalerite? It should have a pale tan to brown streak and 6 directions of cleavage (seldom easily counted). The "other" mineral could be a break-down/alteration product of sphale ...
 
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