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FMF - Friends of Minerals Forum, discussion and message board
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Newest topics and users posts
04 Aug-05:50:34 Re: advice needed on how to get started on a potential project. (Peter Lemkin)
04 Aug-04:34:30 Advice needed on how to get started on a potential project. (Smurfstuff)
03 Aug-14:18:07 Re: tsumeb - deposit of dioptase on calcite. (Roger Warin)
03 Aug-13:05:21 Re: collection of volkmar stingl (Volkmar Stingl)
03 Aug-11:36:18 Re: tsumeb - deposit of dioptase on calcite. (Steveb)
03 Aug-10:56:32 Tsumeb - deposit of dioptase on calcite. (Roger Warin)
03 Aug-07:01:45 Re: stay at home - coronavirus / covid-19 (Peter Lemkin)
02 Aug-23:55:17 Re: collection of volkmar stingl (Volkmar Stingl)
02 Aug-23:11:49 Re: don lum collection (Don Lum)
02 Aug-10:20:30 Re: stay at home - coronavirus / covid-19 (Roger Warin)
02 Aug-09:15:31 Re: collection of michael shaw (Michael Shaw)
02 Aug-00:58:34 Re: stay at home - coronavirus / covid-19 (Peter Lemkin)
01 Aug-14:31:32 Re: stay at home - coronavirus / covid-19 (Don Lum)
01 Aug-14:24:20 Re: stay at home - coronavirus / covid-19 (Riccardo Modanesi)
01 Aug-14:21:52 Re: collection of sante celiberti (Jordi Fabre)
01 Aug-09:27:00 Re: corona covid-19 virus - what is it ? where is it from ? (Roger Warin)
01 Aug-07:15:53 Re: collection of volkmar stingl (Volkmar Stingl)
01 Aug-06:48:22 Re: corona covid-19 virus - what is it ? where is it from ? (Peter Lemkin)
01 Aug-04:45:19 Re: corona covid-19 virus - what is it ? where is it from ? (R Saunders)
31 Jul-22:40:40 Corona covid-19 virus - what is it ? where is it from ? (Roger Warin)
31 Jul-16:32:56 Re: collection of firmo espinar (Firmo Espinar)
30 Jul-14:58:22 Re: melanophlogite? (Luiz Oliveira)
30 Jul-14:51:23 Re: about a rutile epitaxy on hematite in quartz (Roger Warin)
30 Jul-03:36:43 The mizunaka collection - quartz (Am Mizunaka)
29 Jul-22:49:31 Re: collection of volkmar stingl (Volkmar Stingl)

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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: Black, metallic, yellow oxide?
Bob Carnein

Replies: 23
Views: 1154

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: 2028

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: 1154

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: 517

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: 288

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: 497

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: 873

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: 2028

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: 2028

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: 2028

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.
  Topic: Unknown mineral from Pikes Peak pegmatite
Bob Carnein

Replies: 23
Views: 2028

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2021 18:20   Subject: Re: Unknown mineral from Pikes Peak pegmatite
I did try fluorescence, and there is none, in either SW or LW. However, I played around with the lighting, and there is a single fairly planar crack that appears to be perpendicular to the long axis ...
  Topic: Unknown mineral from Pikes Peak pegmatite
Bob Carnein

Replies: 23
Views: 2028

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2021 16:05   Subject: Re: Unknown mineral from Pikes Peak pegmatite
Thanks. I thought about danburite, but the striations still stump me.
  Topic: Unknown mineral from Pikes Peak pegmatite
Bob Carnein

Replies: 23
Views: 2028

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2021 15:38   Subject: Unknown mineral from Pikes Peak pegmatite
A friend asked me to identify this crystal. He found it in a Pikes Peak pegmatite near Lake George, CO. The pegmatite has amazonite, smoky quartz, zircon, and abundant massive topaz surrounded by mi ...
  Topic: Collection of Shawn Spink
Bob Carnein

Replies: 15
Views: 1377

PostForum: Collection photos and Collector's page   Posted: May 13, 2021 18:15   Subject: Re: Collection of Shawn Spink
I'm always glad to help, as are most members of the forum. However, there are some basic tests you should conduct yourself before posting "unknowns". Otherwise, we waste a lot of time with ...
  Topic: Calcite form
Bob Carnein

Replies: 6
Views: 1107

PostForum: Minerals and Mineralogy   Posted: Apr 25, 2021 10:24   Subject: Re: Calcite form
Although I have no idea what the actual Miller indices are, I agree with your assignment of faces to those forms.
  Topic: Soon 15 years of FMF and how to achieve many more
Bob Carnein

Replies: 20
Views: 2878

PostForum: Comments & Suggestions   Posted: Apr 21, 2021 13:52   Subject: Re: Soon 15 years of FMF and how to achieve many more
Thank you for your dedication to this very worthwhile project.
  Topic: Tucson - 2021 April
Bob Carnein

Replies: 25
Views: 6564

PostForum: Mineral Shows   Posted: Apr 19, 2021 18:00   Subject: Re: Tucson - 2021 April
Wow! Too many zeroes for my budget??
  Topic: Green, purple, white and orthoclase conglomerate?
Bob Carnein

Replies: 3
Views: 673

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 19, 2021 09:45   Subject: Re: Green, purple, white and orthoclase conglomerate?
The "triangular shaped vitreous" material looks like fluorite. What you're seeing may be the cleavage, which produces triangular crack patterns. Note that fluorite isn't always purple or b ...
  Topic: Please help to get to know the type of this rock
Bob Carnein

Replies: 13
Views: 1756

PostForum: What is it? - Where is it from?   Posted: Apr 05, 2021 16:01   Subject: Re: Please help to get to know the type of this gem
Can you tell us where you found it or how you acquired it? Offhand, it looks like a tektite; If you use a strong light, is it all translucent? If so, what color is it? Did you reverse the hardness ...
  Topic: Found My First Topaz
Bob Carnein

Replies: 10
Views: 1896

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 27, 2021 18:37   Subject: Re: Found My First Topaz
Perfect cleavage and crystal habit both support your ID! Congratulations.
 
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