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17 Oct-18:44:23 Re: silvia's collection - quartz (Silvia)
17 Oct-15:05:19 Re: silvia's collection (Silvia)
17 Oct-15:03:37 Re: silvia's collection (Silvia)
17 Oct-13:19:12 Re: new generation for picture - ploum (Ploum)
17 Oct-10:34:48 Re: collection of firmo espinar (Firmo Espinar)
17 Oct-10:26:01 Re: silvia's collection (Firmo Espinar)
17 Oct-04:39:40 Re: silvia's collection (James Catmur)
16 Oct-22:58:12 Re: the mizunaka collection - rhodochrosite (Am Mizunaka)
16 Oct-15:59:00 Re: the mizunaka collection - rhodochrosite (Silvia)
16 Oct-15:49:49 Re: silvia's collection (Silvia)
16 Oct-15:36:47 Re: collection of sante celiberti (Sante Celiberti)
16 Oct-14:41:39 Re: new generation for picture - ploum (Ploum)
16 Oct-12:37:34 Munich show (mineralientage) 2021 - looks like it's starting to let up (Jordi Fabre)
16 Oct-03:23:45 Re: new generation for picture - ploum (Ploum)
16 Oct-01:35:08 Re: collection of volkmar stingl (Volkmar Stingl)
15 Oct-22:27:21 The mizunaka collection - rhodochrosite (Am Mizunaka)
15 Oct-17:10:46 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
15 Oct-15:18:13 Re: new generation for picture - ploum (Ploum)
15 Oct-14:42:58 Re: silvia's collection (Silvia)
15 Oct-13:40:49 Re: don lum collection (Don Lum)
15 Oct-11:58:22 Re: article on naica and gypsum (Bob Morgan)
15 Oct-10:03:12 Re: collection of volkmar stingl (Volkmar Stingl)
15 Oct-08:57:54 Re: collection of michael shaw (Michael Shaw)
15 Oct-02:51:59 Re: don lum collection (Tobi)
15 Oct-02:02:35 Re: the tobi martin mineral collection - (38) (Tobi)

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The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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  Topic: The Tobi Martin Mineral Collection - (38)
Bob Carnein

Replies: 20
Views: 1095

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: 342

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: 1076

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: 650

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: 650

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: 753

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: 734

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: 734

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: 658

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: 2124

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: 23
Views: 2301

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: 3204

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: 23
Views: 2301

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 ...
  Topic: 2021 Denver Show(s)
Bob Carnein

Replies: 3
Views: 1274

PostForum: Mineral Shows   Posted: Jul 17, 2021 08:21   Subject: Re: 2021 Denver Show(s)
FYI, Larry Haven has speakers lined up to give talks Thursday, Friday, Saturday, and Sunday at the Denver show. At this point, there are 2 talks scheduled each day, from 10-11 and 11-12. So far, I b ...
  Topic: Identification Help
Bob Carnein

Replies: 2
Views: 547

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 14, 2021 20:12   Subject: Re: Identification Help
These look like quartz crystals coated by something. You need to read the General Guide for using the forum and do some basic tests (e.g. hardness, etc.). Otherwise, we can't really tell what it is ...
  Topic: Help identifying
Bob Carnein

Replies: 4
Views: 844

PostForum: What is it? - Where is it from?   Posted: Jul 02, 2021 20:13   Subject: Re: Help identifying
As you say, the photos are blurry. In the first one, it looks like the black, grainy surface beneath the flakes can be seen through a couple of them. Is this true, or is it simply a reflection? Are ...
  Topic: What rock matt black color high density medium hard ?
Bob Carnein

Replies: 11
Views: 1428

PostForum: What is it? - Where is it from?   Posted: Jun 23, 2021 08:25   Subject: Re: What rock matt black color high density medium hard ?
Unfortunately, the first step in identifying a smooth pebble or cobble is to break it. This gives you an idea of the texture, which can't readily be seen on the outside. Then, to identify most rocks ...
  Topic: Unknown mineral from Pikes Peak pegmatite
Bob Carnein

Replies: 23
Views: 3204

PostForum: What is it? - Where is it from?   Posted: Jun 14, 2021 09:55   Subject: Re: Unknown mineral from Pikes Peak pegmatite
I tried scratching a very flat rhombohedron face on a "Herkimer diamond", and the unknown mineral left some powder and a VERY faint scratch.
  Topic: Unknown mineral from Pikes Peak pegmatite
Bob Carnein

Replies: 23
Views: 3204

PostForum: What is it? - Where is it from?   Posted: Jun 14, 2021 09:46   Subject: Re: Unknown mineral from Pikes Peak pegmatite
I thought of barylite too, but specimens shown on Mindat have a pretty consistent "look" to them, and none look like this crystal.
  Topic: Unknown mineral from Pikes Peak pegmatite
Bob Carnein

Replies: 23
Views: 3204

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2021 20:43   Subject: Re: Unknown mineral from Pikes Peak pegmatite
Harder than steel.
 
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