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Newest topics and users posts
19 Aug-05:59:45 Re: pseudomorph chemistry (James Catmur)
19 Aug-00:57:20 Re: godarts evolves (Jordi Fabre)
19 Aug-00:50:12 Re: godarts evolves (Godsart)
19 Aug-00:20:21 Re: godarts evolves (Godsart)
18 Aug-23:32:43 Re: godarts evolves (Matt_zukowski)
18 Aug-21:44:11 The mizunaka collection - quartz (Am Mizunaka)
18 Aug-20:27:53 Re: godarts evolves (Bob Carnein)
18 Aug-17:49:21 Re: godarts evolves (Godsart)
18 Aug-17:44:17 Re: godarts evolves (Godsart)
18 Aug-17:38:24 Re: godarts evolves (Godsart)
18 Aug-17:32:57 Godarts evolves (Godsart)
18 Aug-16:20:48 Re: pseudomorph chemistry (Silvia)
18 Aug-15:09:09 Re: pseudomorph chemistry (James Catmur)
18 Aug-14:42:18 Re: pseudomorph chemistry (Daniel Garcia)
18 Aug-13:37:58 Malachite after azurite (?) - silvia's collection (Silvia)
18 Aug-12:26:33 Re: pseudomorph chemistry (Peter Lemkin)
18 Aug-04:24:12 Re: pseudomorph chemistry (James Catmur)
18 Aug-03:42:05 Re: pseudomorph chemistry (Daniel Garcia)
18 Aug-02:37:00 Re: pseudomorph chemistry (Roger Warin)
18 Aug-02:04:24 Re: pseudomorph chemistry (Daniel Garcia)
17 Aug-20:05:57 Re: dr. André rostenne’s collection. (Silvia)
17 Aug-13:42:15 Dr. André rostenne’s collection. (Roger Warin)
17 Aug-11:56:54 Re: pseudomorph chemistry (Raystraw)
16 Aug-18:20:41 The mizunaka collection - elbaite (Am Mizunaka)
16 Aug-16:17:16 Re: pseudomorph chemistry (Peter Lemkin)

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  Topic: Calcite is acting strange under UV
Peter Megaw

Replies: 11
Views: 689

PostForum: Minerals and Mineralogy   Posted: Aug 08, 2022 08:11   Subject: Re: Calcite is acting strange under UV
Sorry, misread locality...not Nanisivik so forget MVT

These Indian deposits are hosted in basalts...so different source and explanation, but still one of hundreds of calcite environments and fluore ...
  Topic: Calcite is acting strange under UV
Peter Megaw

Replies: 11
Views: 689

PostForum: Minerals and Mineralogy   Posted: Aug 08, 2022 08:09   Subject: Re: calcite is acting strange under UV
Calcite has a very wide range of fluorescent responses stemming from a wide range of trace amounts of activators and sensitizers. This is a VERY deep rabbit hole you have headed down...

The orange ...
  Topic: Datolite locality question
Peter Megaw

Replies: 9
Views: 703

PostForum: What is it? - Where is it from?   Posted: Jul 31, 2022 13:26   Subject: Re: Datolite locality question
The little green crystals in your second photo look more right for datolite
  Topic: Datolite locality question
Peter Megaw

Replies: 9
Views: 703

PostForum: What is it? - Where is it from?   Posted: Jul 31, 2022 12:49   Subject: Re: Datolite locality question
I wondered that too...UV would tell too and it's nondestructive. Datolite is also harder (5+ vs 3) so a well placed pin will tell you a lot
  Topic: Datolite locality question
Peter Megaw

Replies: 9
Views: 703

PostForum: What is it? - Where is it from?   Posted: Jul 31, 2022 12:20   Subject: Re: Datolite locality question
I agree with Kevin's calls on the associated species (I suspect the calcite is orange-pink fluorescent, which unfortunately doesn't narrow things down either). However, neither the habit nor the color ...
  Topic: Quartz confusion
Peter Megaw

Replies: 2
Views: 548

PostForum: What is it? - Where is it from?   Posted: Jun 27, 2022 15:03   Subject: Re: Quartz confusion
Hello Nirvash, What you have is clearly a quartz crystal. When quartz is purple it is the variety amethyst. There are a range of colored quartzes, with pretty much every color getting its own name
  Topic: Please help ID, maybe pyrite?
Peter Megaw

Replies: 4
Views: 711

PostForum: What is it? - Where is it from?   Posted: Jun 22, 2022 13:09   Subject: Re: Please help ID, maybe pyrite?
These are oxidized pyrite cubes. They are now some form of hydrated iron oxide... You can call them "goethite pseudomorphs after pyrite". These are called "limonite dice" in the s ...
  Topic: Weird Mineral, River Find
Peter Megaw

Replies: 4
Views: 657

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 31, 2022 11:52   Subject: Re: Weird Mineral, River Find
Thanks for posting. There is a guide on the home page to features we like to see to help make identifications, please check it out so you can get an idea how hardness, streak etc. help.

That said, ...
  Topic: Mineral Label Translation
Peter Megaw

Replies: 8
Views: 1363

PostForum: What is it? - Where is it from?   Posted: May 11, 2022 13:16   Subject: Re: Mineral Label Translation
Danke Sehr
  Topic: Mineral Label Translation
Peter Megaw

Replies: 8
Views: 1363

PostForum: What is it? - Where is it from?   Posted: May 11, 2022 10:40   Subject: Re: Mineral Label Translation
Schafstiel = sheep stem or sheep stalk = ram's horn? Would fit the shape
  Topic: Help needed regarding first emerald
Peter Megaw

Replies: 2
Views: 659

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 13, 2022 15:22   Subject: Re: Help needed regarding first emerald
Hello, We don't want to seem unfriendly, but this forum is for discussion of various non-commercial aspects of minerals and mineral collecting, we expressly do not get involved in valuations or sales.
  Topic: Measuring the specific gravity?
Peter Megaw

Replies: 13
Views: 2313

PostForum: Off-Topic and Introductions   Posted: Dec 30, 2021 14:26   Subject: Re: Measuring the specific gravity?
John Betts gave a great talk on a really simplified SG test at Rochester a few years back, He generated a video of it which is posted on John Betts Fine Minerals website.

Add the www. to the below ...
  Topic: Peruvian / French or Cornish Chalcopyrite on Fluorite?
Peter Megaw

Replies: 12
Views: 3128

PostForum: What is it? - Where is it from?   Posted: Dec 29, 2021 11:41   Subject: Re: Peruvian / French or Cornish Chalcopyrite on Fluorite?
Por mi parte...no es de Mexico
  Topic: In Memoriam: Charlie Key
Peter Megaw

Replies: 5
Views: 1926

PostForum: In Memoriam   Posted: Dec 28, 2021 11:07   Subject: Re: In Memoriam: Charlie Key
Sir Charles in action at TGMS.

I felt I had arrived as a collector when Charles looked at a recently acquired specimen in my collection and said "that's an important piece!"...and almos ...
  Topic: San Pedro Corralitos unknown
Peter Megaw

Replies: 8
Views: 1789

PostForum: What is it? - Where is it from?   Posted: Dec 23, 2021 16:28   Subject: Re: San Pedro Corralitos unknown
John...I'm going to go along with Lluis...probably a manganese oxide, given the amount of zinc around likely chalcophanite...it is very common at Santa Eulalia and Ojuela and often has that quasi blui ...
  Topic: Clinoclase, Boleo, Baja California, Mexico ?
Peter Megaw

Replies: 6
Views: 2583

PostForum: What is it? - Where is it from?   Posted: Nov 08, 2021 19:07   Subject: Re: Clinoclase, Boleo, Baja California, Mexico ?
Hello, somehow missed this. I also have paratacamite that looks like this and would agree with Alfredo that an arsenate from Boleo would be exceptional given an overall lack of arsenic
  Topic: Mystery Hopper Octahedral Pseudomorph
Peter Megaw

Replies: 1
Views: 1341

PostForum: What is it? - Where is it from?   Posted: Nov 03, 2021 15:22   Subject: Mystery Hopper Octahedral Pseudomorph
An elderly neighbor recently gave me this interesting hoppered octahedral (?) pseudomorph. He was an industrial minerals geologist who specialized in sulfur, zeolites and evaporites, but doesn't reme ...
  Topic: Article on Naica and Gypsum
Peter Megaw

Replies: 4
Views: 2356

PostForum: Mineralogical Literature   Posted: Oct 14, 2021 09:54   Subject: Re: Article on Naica and Gypsum
https://www.foro-minerales.com/forum/gen_imag/Cristales_Naica-Chemical_Society_Reviews/Cristales_Naica-Chemical_Society_Reviews.pdf

Here is a much more detailed treatment of the science...

Still ...
  Topic: Tracing the dealer "Minerals Engineering" or Brian Petrovic
Peter Megaw

Replies: 2
Views: 2958

PostForum: The histories behind mineral specimens   Posted: Sep 17, 2021 09:30   Subject: Re: Tracing the dealer "Minerals Engineering" or Brian Petrovic
Tom, You might try Andy Stucki at Siber and Siber in Zurich
  Topic: Ajoite From Messina
Peter Megaw

Replies: 3
Views: 2020

PostForum: Minerals and Mineralogy   Posted: Aug 27, 2021 16:56   Subject: Re: Ajoite From Messina
Roger, Ajoite is famous for "deteriorating" into chrysocolla, so my first guess would be that that's what you're seeing rather than a compositional shift within an ajoite-XXX series. (yes, I ...
 
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