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Newest topics and users posts
02 Jul-14:58:25 The mizunaka collection - calcite with pyrite (Am Mizunaka)
02 Jul-14:44:48 Sainte-marie-aux-mines 2022 - the new discoveries (1) (Jordi Fabre)
01 Jul-16:16:08 Re: pyromorphite and ...? (Colin Robinson)
01 Jul-13:56:47 Re: twinned topaz? (John S. White)
01 Jul-12:20:34 Re: pyromorphite and ...? (Forrestblyth)
01 Jul-11:34:01 Re: caldbeck cumbria mineral (Forrestblyth)
01 Jul-11:25:31 Re: pyromorphite and ...? (Forrestblyth)
01 Jul-10:32:27 Re: twinned topaz? (Bob Carnein)
01 Jul-10:17:29 Re: collection of volkmar stingl (Volkmar Stingl)
01 Jul-10:15:24 Re: twinned topaz? (Yannick Cosson)
01 Jul-08:51:24 Re: twinned topaz? (Pete Richards)
01 Jul-07:43:29 Re: twinned topaz? (Josele)
01 Jul-06:38:46 Re: twinned topaz? (Bob Morgan)
01 Jul-05:07:43 Twinned topaz? (Yannick Cosson)
30 Jun-23:13:16 The mizunaka collection - fluorite (Am Mizunaka)
30 Jun-16:35:12 Re: pyromorphite and ...? (Colin Robinson)
30 Jun-16:29:27 Re: collection of firmo espinar (Firmo Espinar)
30 Jun-16:27:07 Re: linarite (Colin Robinson)
30 Jun-16:18:29 Re: barytocalcite (Colin Robinson)
30 Jun-14:20:08 Re: spherical inclusions in amethyst - cristobalite? vs fluorite (Roger Warin)
30 Jun-14:06:03 Re: spherical inclusions in amethyst - cristobalite? vs fluorite (Amir Akhavan)
30 Jun-08:05:23 Baryte (Forrestblyth)
30 Jun-07:58:42 Barytocalcite (Forrestblyth)
30 Jun-07:50:45 Re: caldbeck cumbria mineral (Kevin Schofield)
30 Jun-07:49:05 Baryte (Forrestblyth)

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  Topic: Quartz confusion
Peter Megaw

Replies: 2
Views: 329

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: 415

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: 476

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: 986

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: 986

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: 542

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: 2007

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: 2778

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: 1630

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: 1570

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: 2375

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: 1242

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: 2083

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: 2791

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: 1903

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 ...
  Topic: Fluorite from where?
Peter Megaw

Replies: 10
Views: 3221

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 18, 2021 14:14   Subject: Re: Fluorite from where?
Might also help if you gave it a bath!
  Topic: Fluorite from where?
Peter Megaw

Replies: 10
Views: 3221

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 18, 2021 13:54   Subject: Re: Fluorite from where?
Could you include a photograph of the bottom...sometimes even a bit of matrix helps identify or eliminate possibilities
  Topic: Tsumeb Zincolivenite association - light blue acicular mineral = ?
Peter Megaw

Replies: 3
Views: 1593

PostForum: Minerals and Mineralogy   Posted: Aug 04, 2021 10:08   Subject: Re: Tsumeb Zincolivenite Association - light blue acicular mineral = ?
with the pale blue color and extremely elongate crystals I would suspect aurichalcite over rosasite...but there are several acicular blue alternatives for Tsumeb...stranskyite?
  Topic: 2021 Denver Show(s)
Peter Megaw

Replies: 3
Views: 3209

PostForum: Mineral Shows   Posted: Jul 17, 2021 10:01   Subject: Re: 2021 Denver Show(s)
Worth noting that the Denver Council Show...the outfit that kicked things off in Denver...is celebrating FLUORITE as their theme this year...should be very popular. Most (all?) Of the talks will be on ...
  Topic: What is this rock formation?
Peter Megaw

Replies: 5
Views: 2017

PostForum: What is it? - Where is it from?   Posted: Jul 04, 2021 20:35   Subject: Re: What is this rock formation?
What formation is it from? Edwards?

This looks like a textbook concretion...a banded onion-like body that forrms during diagenesis/lithification where something (fossil, organic nucleus etc) acts a ...
 
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