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11 May-21:01:46 Re: the mizunaka collection - fluorite (Am Mizunaka)
11 May-08:49:40 Re: a mineralogical trip through germany / baden-wuerttemberg (Tobi)
11 May-08:44:49 Re: the mizunaka collection - fluorite (Tobi)
11 May-06:20:29 Re: collection of volkmar stingl (Volkmar Stingl)
11 May-04:39:24 Re: soon 15 years of fmf and how to achieve many more (James Catmur)
11 May-02:11:53 Re: soon 15 years of fmf and how to achieve many more (Peter Lemkin)
10 May-23:55:01 The mizunaka collection - fluorite (Am Mizunaka)
10 May-21:34:36 Re: don lum collection (Don Lum)
10 May-12:52:14 Re: a mineralogical trip through germany / baden-wuerttemberg (Jesse Fisher)
10 May-12:23:01 Re: soon 15 years of fmf and how to achieve many more (Makokerowill)
09 May-23:10:51 Re: magnetic serpentine? (Ken)
09 May-11:45:05 Re: collection of michael shaw (Michael Shaw)
09 May-11:22:06 Re: collection of firmo espinar (Firmo Espinar)
08 May-11:32:22 Re: hillman hall of minerals and gems (Tom Mazanec)
08 May-02:15:29 Re: magnetic serpentine? (Alfredo)
08 May-00:00:15 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)
07 May-21:45:34 Magnetic serpentine? (Ken)
07 May-13:00:12 Re: collection of benjamin carballo (Benj)
07 May-07:03:24 Re: collection of david carter (Jordi Fabre)
07 May-06:44:30 Re: collection of david carter (David916)
07 May-06:36:35 Re: collection of benjamin carballo (Benj)
07 May-06:29:30 Re: collection of david carter (David916)
06 May-19:49:56 Re: the mizunaka collection - quartz over chrysocolla (Am Mizunaka)
06 May-14:33:39 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
06 May-10:24:20 Re: collection of david carter (David916)

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  Topic: A new mineral: alpha-calcium formate
Pete Richards

Replies: 9
Views: 711

PostForum: Minerals and Mineralogy   Posted: May 02, 2021 20:45   Subject: Re: A new mineral: alpha-calcium formate
The old notion that minerals must be free of anthropogenic or other biologic influence , and must be inorganic chemical compounds, has long become one of mostly historic interest, with some organic sa ...
  Topic: Calcite form
Pete Richards

Replies: 6
Views: 591

PostForum: Minerals and Mineralogy   Posted: Apr 25, 2021 16:34   Subject: Re: Calcite form
(snip)...
Anybody knows how many calcite forms are listed in Goldschmidt Atlas der Krystallformen?
...

It is necessary to distinguish between the term "form" in the strict crystallo ...
  Topic: Calcite form
Pete Richards

Replies: 6
Views: 591

PostForum: Minerals and Mineralogy   Posted: Apr 25, 2021 12:00   Subject: Re: Calcite form
I think those forms are pretty reasonable guesses. {012} for sure. {0 16 1} is possible. {541} is about in the right place.

Attached is a smorf drawing I made of a crystal with these forms. Anyon ...
  Topic: Hillman Hall of Minerals and Gems
Pete Richards

Replies: 5
Views: 662

PostForum: Other Museums in USA   Posted: Apr 11, 2021 08:14   Subject: Re: Hillman Hall of Minerals and Gems
It is an excellent mineral museum. Enjoy it. But check before you go to make sure they are open!
  Topic: Melanophlogite?
Pete Richards

Replies: 10
Views: 1074

PostForum: What is it? - Where is it from?   Posted: Apr 07, 2021 13:27   Subject: Re: Melanophlogite?
From the photograph, I would have to guess quartz, maybe including broken fragments of a fine-grained quartz like jasper. Of the options you list, none is reasonable except chalcedony, both because t ...
  Topic: what stones are these?
Pete Richards

Replies: 15
Views: 1498

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 23, 2021 13:09   Subject: Re: what stones are these?
I agree that it's not granite, and it's due to the lack of color, or at least the lack of color variety. Granite has quartz, which is usually transucent grey, feldspar which can be white or pink, and ...
  Topic: Found in Peoria Arizona, please help identify. Not my normal find.
Pete Richards

Replies: 7
Views: 928

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 22, 2021 20:39   Subject: Re: Found in Peoria Arizona, please help identify. Not my normal find.
Nice photograph! Is the object about 1/4"?

In order to help you further we need some information that you can provide. Will one of these objects fizz in warm vinegar? Will an edge of one scr ...
  Topic: In-situ photos at Pizzo Forno, Alpe Sponda (Ticino) ?
Pete Richards

Replies: 7
Views: 1375

PostForum: Mines and Mineral Localities   Posted: Mar 18, 2021 12:38   Subject: Re: In-situ photos at Pizzo Forno, Alpe Sponda (Ticino) ?
I heard once from a credible source that Pizzo Forno is a dummy locality, selected by the Strahlers to prevent people from learning of the real location of the wonderful kyanite and staurolite specime ...
  Topic: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
Pete Richards

Replies: 9
Views: 1553

PostForum: Minerals and Mineralogy   Posted: Mar 08, 2021 19:19   Subject: Re: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
Looks to me like it may be a question of the color of the matrix underneath the crystals. Purple creedite is on dark-colored matrix, pink is on light colored matrix or is thick enough that the matrix ...
  Topic: Help needed
Pete Richards

Replies: 17
Views: 2766

PostForum: What is it? - Where is it from?   Posted: Mar 07, 2021 08:24   Subject: Re: Help needed
Most likely hematite, but it could be ilmenite as well.
  Topic: Please help id this olive green rock
Pete Richards

Replies: 5
Views: 1177

PostForum: What is it? - Where is it from?   Posted: Feb 20, 2021 19:08   Subject: Re: Please help id this olive green rock
The second and third photos from the end show black spheroids which probably are droplets of the metal being smelted. It might be interesting to test these with a small, powerful magnet. You can han ...
  Topic: Mineral spirituality?
Pete Richards

Replies: 19
Views: 11956

PostForum: Minerals and Mineralogy   Posted: Feb 11, 2021 17:57   Subject: Re: Is this beryl?
I think you've done a great job of sleuthing this out! Enjoy your beryl!
  Topic: Mineral spirituality?
Pete Richards

Replies: 19
Views: 11956

PostForum: Minerals and Mineralogy   Posted: Feb 11, 2021 10:40   Subject: Re: Is this beryl?
Now if you go to Webmineral.com you can do a search and find all minerals with a hardness of 8. (There are 28). Probably you will be able to rule out most of them based on scarcity, locality, etc.
  Topic: Quartz, with?
Pete Richards

Replies: 3
Views: 1183

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 10, 2021 13:11   Subject: Re: Quartz, with?
Most likely the silver granules are pyrite, a form of iron sulfide. The brown stuff is probably a mixture of several iron oxides, which may have resulted at least in part from the weathering of pyrit ...
  Topic: Mineral spirituality?
Pete Richards

Replies: 19
Views: 11956

PostForum: Minerals and Mineralogy   Posted: Feb 08, 2021 11:16   Subject: Re: Is this beryl?
This still looks like quartz to me. Quartz and ordinary beryl (not highly colored) are very difficult to tell apart in the field - and also by eye.

A hardness test will help, but the hardness of ...
  Topic: Help
Pete Richards

Replies: 4
Views: 1150

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 06, 2021 12:43   Subject: Re: Help
This seems to be a septarian concretion. They form by precipitation of minerals in soft sediments that eventually become rock, typically round. The minerals form around a center, which is what gives ...
  Topic: Help needed
Pete Richards

Replies: 17
Views: 2766

PostForum: What is it? - Where is it from?   Posted: Jan 29, 2021 16:00   Subject: Re: Help needed
On top of that, orthoclase becomes microcline as it cools down, if it has time. And there is debate about whether there is such a thing as primary microcline - i.e. microcline that did not start out ...
  Topic: Help identifying rock needed! Thank you!
Pete Richards

Replies: 2
Views: 759

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 24, 2021 19:53   Subject: Re: Help identifying rock needed! Thank you!
No one can provide more than guesses about your stone with the information you provide. Most will suggest that it is quartz, which is probably true, but not consistent with your statement that it is v ...
  Topic: Final balance time.
Pete Richards

Replies: 18
Views: 4253

PostForum: Comments & Suggestions   Posted: Jan 10, 2021 16:38   Subject: Re: Final balance time.
Hi Sante,

I did not add much to my collection this year, but I certainly enjoy seeing your additions! The anatase, brookite, and particularly the fluorite are pieces I would be glad to have in my ...
  Topic: Pyrite with bubble-like growths
Pete Richards

Replies: 21
Views: 4721

PostForum: Minerals and Mineralogy   Posted: Jan 07, 2021 14:57   Subject: Re: Pyrite with bubble-like growths
This thread has produced a lot more comments than I had expected! I feel I should respond briefly to the ones since my last comment. In order in which they were posted:

Philippe: There could be ...
 
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