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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 255 matches |
| Author | Message |
|---|---|
 Topic: Quartz Japan Twin |
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| Bob Carnein Replies: 9 Views: 2519 |
 Forum: Minerals and Mineralogy Posted: Aug 16, 2025 21:14 Subject: Re: Quartz Japan Twin |
| At first, I thought it might be a grieserntal twin, but it appears that the angle between the two crystals on the left is near 90 degrees while the angle between the crystals on the right is more than ... | |
| Topic: The most over-rated/overpriced species??? |
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| Bob Carnein Replies: 7 Views: 2290 |
Forum: Minerals and Mineralogy Posted: Aug 15, 2025 20:37 Subject: Re: The most over-rated/overpriced species??? |
| When I hear the word "influencer", the first thing that comes to mind is "manipulator" and the second is "shallow". In short, a pest. | |
| Topic: Curious fluorescent metamorphic rock |
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| Bob Carnein Replies: 2 Views: 810 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Aug 13, 2025 08:35 Subject: Re: Curious fluorescent metamorphic rock |
| Hi, That's most likely sphalerite (orange fluorescent) and baryte from the Hot Springs district, Madison Co., North Carolina. It has produced material that looks like this for many years. | |
| Topic: Researching location information for old specimens. |
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| Bob Carnein Replies: 5 Views: 1347 |
Forum: The histories behind mineral specimens Posted: Aug 10, 2025 18:08 Subject: Re: Researching location information for old specimens. |
| Unfortunately, I think we all know of some unscrupulous dealers who have made up locality attributions, thinking that was OK, especially if the customer was not one of the cognoscenti--it's bad-boy st ... | |
| Topic: Identification of 2 minerals under microscope |
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| Bob Carnein Replies: 13 Views: 1504 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 28, 2025 15:33 Subject: Re: Identification of 2 minerals under microscope |
| I agree. | |
| Topic: Identification of 2 minerals under microscope |
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| Bob Carnein Replies: 13 Views: 1504 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 28, 2025 12:57 Subject: Re: Identification of 2 minerals under microscope |
| Sphene is another possibility for the diamond-shaped crystals. | |
| Topic: Identification of 2 minerals under microscope |
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| Bob Carnein Replies: 13 Views: 1504 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 28, 2025 11:58 Subject: Re: Identification of 2 minerals under microscope |
| If you are referring to what's inside the diamond--shaped, cracked crystals, I think that is zircon. Considering that this is a gneiss, the diamond-shaped crytals might be sillimanite. | |
| Topic: Identification of 2 minerals under microscope |
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| Bob Carnein Replies: 13 Views: 1504 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 28, 2025 11:31 Subject: Re: Identification of 2 minerals under microscope |
| It looks to me like zircon. The high relief and pleochroic halos are typical. | |
| Topic: Please help me identify this stone |
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| Bob Carnein Replies: 2 Views: 2041 |
Forum: What is it? - Where is it from? Posted: May 23, 2025 09:30 Subject: Re: Please help me identify this stone |
| Where is it from? | |
| Topic: Quartz Twins |
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| Bob Carnein Replies: 6 Views: 4959 |
Forum: Minerals and Mineralogy Posted: May 07, 2025 09:39 Subject: Re: Quartz Twins |
| Thanks so much to Bob and Pete for their insights. My top priority is clearing away 16 inches of fresh snow, but when I finish, I'll check some of the questions. In the meantime, I appreciate the co ... | |
| Topic: Quartz Twins |
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| Bob Carnein Replies: 6 Views: 4959 |
Forum: Minerals and Mineralogy Posted: May 05, 2025 12:41 Subject: Quartz Twins |
| Considering the great recent "Rocks & Minerals" articles by Carl Francis and Pete Richards on quartz twins, I will post a few specimens from my collection. | |
| Topic: Ghost dendrite |
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| Bob Carnein Replies: 7 Views: 3779 |
Forum: Minerals and Mineralogy Posted: May 02, 2025 18:22 Subject: Re: Ghost dendrite |
| I'm curious to know whether the cabochon has been regularly or continuously exposed to light. Also, it's interesting that no change occurred to the more opaque inclusions to the upper right. It mig ... | |
| Topic: An interesting 10 inch multi mineral Blackdene plate |
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| Bob Carnein Replies: 4 Views: 2152 |
Forum: Micros & Macros - Images of Minerals Posted: Apr 05, 2025 09:52 Subject: Re: An interesting 10 inch multi mineral Blackdene plate |
| James is right. The crystal habit appears to be that of calcite. | |
| Topic: A true morphological twin of quartz according to the Dauphiné law. |
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| Bob Carnein Replies: 5 Views: 4239 |
Forum: What is it? - Where is it from? Posted: Mar 04, 2025 16:47 Subject: Re: A true morphological twin of quartz according to the Dauphiné law. |
| Thank you. I'll check that out. | |
| Topic: A true morphological twin of quartz according to the Dauphiné law. |
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| Bob Carnein Replies: 5 Views: 4239 |
Forum: What is it? - Where is it from? Posted: Mar 03, 2025 12:01 Subject: Re: A true morphological twin of quartz according to the Dauphiné law. |
| Pete, Can you possibly send a reference (for those of us who are twin fans but not experts) to a Dauphine contact twin? If there are two different "Dauphine" twin laws (contact and penetrat ... | |
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