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| A general guide for using the Forum with some rules and tips
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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| Search found 116 matches |
| Author | Message |
|---|---|
 Topic: Alabama Copper? Quartz or Quartzite and red to almost green mineral along with?? |
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| Bob Carnein Replies: 4 Views: 365 |
 Forum: 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 |
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| Bob Carnein Replies: 11 Views: 912 |
Forum: 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 |
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| Bob Carnein Replies: 4 Views: 668 |
Forum: 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. |
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| Bob Carnein Replies: 3 Views: 588 |
Forum: 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 |
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| Bob Carnein Replies: 3 Views: 1004 |
Forum: 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! |
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| Bob Carnein Replies: 14 Views: 2472 |
Forum: 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 |
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| Bob Carnein Replies: 15 Views: 2947 |
Forum: 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 |
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| Bob Carnein Replies: 10 Views: 1513 |
Forum: 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 |
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| Bob Carnein Replies: 7 Views: 1045 |
Forum: 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 |
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| Bob Carnein Replies: 6 Views: 2062 |
Forum: 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 |
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| Bob Carnein Replies: 6 Views: 2062 |
Forum: 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 |
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| Bob Carnein Replies: 4 Views: 2057 |
Forum: 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 |
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| Bob Carnein Replies: 4 Views: 2057 |
Forum: 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? |
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| Bob Carnein Replies: 5 Views: 2485 |
Forum: 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 |
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| Bob Carnein Replies: 12 Views: 2649 |
Forum: 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 |
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| Bob Carnein Replies: 9 Views: 2087 |
Forum: 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 :) |
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| Bob Carnein Replies: 12 Views: 2299 |
Forum: 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 |
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| Bob Carnein Replies: 3 Views: 2212 |
Forum: 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 |
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| Bob Carnein Replies: 3 Views: 2212 |
Forum: 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 |
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| Bob Carnein Replies: 16 Views: 3713 |
Forum: 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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