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Newest topics and users posts
08 Mar-01:34:48 The mizunaka collection - elbaite (Am Mizunaka)
07 Mar-16:29:01 Re: collection of firmo espinar (Firmo Espinar)
07 Mar-11:45:27 Re: help needed (Sante Celiberti)
07 Mar-11:32:26 Re: help needed (Sante Celiberti)
07 Mar-11:27:07 Re: help needed (James Catmur)
07 Mar-08:24:55 Re: help needed (Pete Richards)
07 Mar-08:22:03 Re: help needed (Dany Mabillard)
07 Mar-07:58:27 Re: collection from dany mabillard (Dany Mabillard)
07 Mar-07:19:53 Re: collection from dany mabillard (James Catmur)
07 Mar-04:28:18 Re: collection from dany mabillard (Jordi Fabre)
07 Mar-01:40:59 Re: collection from dany mabillard (Volkmar Stingl)
07 Mar-01:17:10 Re: the mizunaka collection (Am Mizunaka)
06 Mar-17:24:58 Re: the mizunaka collection (Sante Celiberti)
06 Mar-17:02:24 Re: collection from dany mabillard (Sante Celiberti)
06 Mar-16:26:02 Popular minerals - creedite from navidad mine, mexico (Jordi Fabre)
06 Mar-16:23:02 Re: collection from dany mabillard (Sante Celiberti)
06 Mar-16:20:43 The mizunaka collection - quartz (Am Mizunaka)
06 Mar-15:34:21 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
06 Mar-15:29:49 Re: collection from dany mabillard (Dany Mabillard)
06 Mar-15:24:34 Re: collection from dany mabillard (Dany Mabillard)
05 Mar-17:39:20 Re: collection from dany mabillard (Sante Celiberti)
05 Mar-13:01:19 Re: collection from dany mabillard (Dany Mabillard)
05 Mar-10:20:51 Re: collection of michael shaw (Michael Shaw)
05 Mar-03:25:18 The mizunaka collection - smoky quartz (Am Mizunaka)
05 Mar-00:11:17 Re: collection of volkmar stingl (Volkmar Stingl)

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  Topic: Alabama Copper? Quartz or Quartzite and red to almost green mineral along with??
Bob Carnein

Replies: 4
Views: 365

PostForum: What is it? - Where is it from?   Posted: Mar 03, 2021 11:25   Subject: Re: Alabama Copper? Quartz or Quartzite and red to almost green mineral along with??
The last photo looks like mica schist, but these pictures could have been taken in many places with similar geology. There are a half dozen mineral clubs in Alabama. Your best bet is to find a club ...
  Topic: I want to know this stone
Bob Carnein

Replies: 11
Views: 912

PostForum: What is it? - Where is it from?   Posted: Feb 23, 2021 16:16   Subject: Re: I want to know this stone
It looks, to me, like a piece of quartzite. How did you measure the hardness?
  Topic: Help
Bob Carnein

Replies: 4
Views: 668

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 06, 2021 15:52   Subject: Re: Help
FYI, the lighter material filling the "cracks" in the concretion is typically the mineral calcite and is often fluorescent in ultraviolet light. Fluorescent specimens are their own collecti ...
  Topic: Metallic / crystalline flat beach find.
Bob Carnein

Replies: 3
Views: 588

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 29, 2021 16:17   Subject: Re: Metallic / crystalline flat beach find.
This looks like a piece of garnet-mica schist. Are the dark pieces harder than glass or a knife blade? Based on your photos, I think the "sparkly" stuff is most likely muscovite mica.
  Topic: When the Financial Times talks about minerals
Bob Carnein

Replies: 3
Views: 1004

PostForum: Comments & Suggestions   Posted: Jan 11, 2021 13:08   Subject: Re: When the Financial Times talks about minerals
Luckily, there is a place in the hobby for people who love minerals and don't care about the hype. The investor-collector community clearly has a place, but that really isn't where most of the collec ...
  Topic: This crazy mineral market!
Bob Carnein

Replies: 14
Views: 2472

PostForum: Comments & Suggestions   Posted: Jan 02, 2021 17:17   Subject: Re: This crazy mineral market!
Thank goodness the mineral market doesn't always make sense!
  Topic: Proposed new system for classifying minerals
Bob Carnein

Replies: 15
Views: 2947

PostForum: Minerals and Mineralogy   Posted: Dec 28, 2020 12:56   Subject: Re: Proposed new system for classifying minerals
By itself, the article doesn't really say much. Although I value Hazen's work and think he has popularized something that many geoscientists already knew, I don't see how the proposal can be implemen ...
  Topic: Stumped. Help with identifying
Bob Carnein

Replies: 10
Views: 1513

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 30, 2020 11:33   Subject: Re: Stumped. Help with identifying
I'm with Peter on this, though I'm not sure about the tourmaline--I think it's more likely quartz with some K-feldspar and maybe biotite mica. Wisconsin ice extended more that half-way south through ...
  Topic: Long time listener.. first time caller. Gifted from underground coal mine
Bob Carnein

Replies: 7
Views: 1045

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 29, 2020 19:02   Subject: Re: Long time listener.. first time caller. GIFTED FROM UNDERGROUND COAL MINE
This appears to be calcite, but there are both white parts and brown parts in your photo. You can do several things to test it. Break a piece off and see whether it breaks into diamond-shaped pieces ...
  Topic: Pectolite? from Maoping Quarry, Wuyishan, China
Bob Carnein

Replies: 6
Views: 2062

PostForum: What is it? - Where is it from?   Posted: Nov 29, 2020 12:03   Subject: Re: Pectolite? from Maoping Quarry, Wuyishan, China
When I blow up the image, I see what looks like purple quartz in the lower portion of the sample. Is that real, or is it my imagination playing tricks?
  Topic: Pectolite? from Maoping Quarry, Wuyishan, China
Bob Carnein

Replies: 6
Views: 2062

PostForum: What is it? - Where is it from?   Posted: Nov 29, 2020 11:27   Subject: Re: Pectolite? from Maoping Quarry, Wuyishan, China
I agree with Jordi, but, in any case, doing some analytical work would be justified.
  Topic: Quartz with small garnets
Bob Carnein

Replies: 4
Views: 2057

PostForum: What is it? - Where is it from?   Posted: Oct 28, 2020 09:19   Subject: Re: Quartz with small garnets
The close-up appears to be a garnet-mica schist. Personally, I doubt that there would be any value in assaying it. Such rocks cover huge areas in many mountain belts and don't normally contain anyth ...
  Topic: Quartz with small garnets
Bob Carnein

Replies: 4
Views: 2057

PostForum: What is it? - Where is it from?   Posted: Oct 27, 2020 20:11   Subject: Re: Quartz with small garnets
Garnet varieties can't be positively identified by sight. That said, the "normal" garnet in metamorphic rocks such as gneiss or mica schist is almandine. Almandine indicates medium grade r ...
  Topic: Merelaniite Inclusions?
Bob Carnein

Replies: 5
Views: 2485

PostForum: Micros & Macros - Images of Minerals   Posted: Oct 02, 2020 17:02   Subject: Re: Merelaniite Inclusions?
That's very cool!
  Topic: Please help! Shiny dark green crystals
Bob Carnein

Replies: 12
Views: 2649

PostForum: What is it? - Where is it from?   Posted: Sep 25, 2020 09:14   Subject: Re: Please help! Shiny dark green crystals
The somewhat diamond shaped cross sections on some of the crystals, combined with apparent cleavage, suggest an amphibole. The amphiboles and pyroxenes are among the most difficult minerals to ID and ...
  Topic: Please help me identify
Bob Carnein

Replies: 9
Views: 2087

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 23, 2020 15:33   Subject: Re: Please help me identify
I'll bet you're picking mushrooms in Michigan (not the Moon). Looks like native copper. I would scrape it lightly with a knife in an inconspicuous place. If it's copper, it will be obvious to you i ...
  Topic: Please help with identification :)
Bob Carnein

Replies: 12
Views: 2299

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 13, 2020 09:30   Subject: Re: Please help with identification :)
How accurate is your SG measurement? It's good for hematite but too high for goethite. Is the streak reddish brown or yellowish brown (which?)? If reddish, it's probably hematite; if yellowish, I'd ...
  Topic: New technology for crystal models
Bob Carnein

Replies: 3
Views: 2212

PostForum: Off-Topic and Introductions   Posted: Jul 08, 2020 09:47   Subject: Re: New technology for crystal models
Thank you, Josele, for referring me to that thread. I especially enjoyed the posts about quartz crystals and whether a face perpendicular to the c axis is a pedion or a pinacoid. FMF is a great plac ...
  Topic: New technology for crystal models
Bob Carnein

Replies: 3
Views: 2212

PostForum: Off-Topic and Introductions   Posted: Jul 07, 2020 16:19   Subject: New technology for crystal models
Forgive me if Forum users already know about this or if this post violates Forum rules, but it's brand-new to me and will be of interest to at least some of you. One of my favorite mineralogical obje ...
  Topic: Tourmaline
Bob Carnein

Replies: 16
Views: 3713

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 05, 2020 16:12   Subject: Re: Tourmaline
Be aware that tourmaline has various pyramids that intersect the prism faces at various angles, some steep, others shallow.
 
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