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21 Feb-22:26:53 Re: the joy of tucson, 2020 gail spann experience (Gail)
21 Feb-22:16:51 Re: the joy of tucson, 2020 gail spann experience (Gail)
21 Feb-15:43:14 Re: building a great mineral collection? (Basti)
21 Feb-15:14:52 Re: unidentified green crystal (Pete Modreski)
21 Feb-15:14:48 Re: celestine (Bob Harman)
21 Feb-15:09:46 Re: unidentified green crystal (Alfredo)
21 Feb-14:50:30 Celestine (Stefan Koch)
21 Feb-14:40:58 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
21 Feb-14:16:12 Re: unidentified green crystal (Mkomishyn)
21 Feb-13:56:56 Re: la morita mine (Peter Megaw)
21 Feb-13:50:54 La morita mine (John Betts)
21 Feb-10:24:10 Re: collection of firmo espinar (Firmo Espinar)
21 Feb-10:21:12 Re: tucson show 2020 (Bob Harman)
21 Feb-01:27:20 Re: the state of modern geology (Matt_zukowski)
21 Feb-00:20:32 Re: the state of modern geology (Peter Lemkin)
20 Feb-23:01:19 Re: building a great mineral collection? (Bob Morgan)
20 Feb-22:17:49 Re: don lum collection (Don Lum)
20 Feb-19:08:12 Re: the state of modern geology (Marvinlewinsky)
20 Feb-18:24:17 The mizunaka collection - quartz (Am Mizunaka)
20 Feb-17:33:19 Re: the state of modern geology (Peter Megaw)
20 Feb-15:31:42 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
20 Feb-11:21:43 Re: building a great mineral collection? (David Dinsmore)
20 Feb-09:09:06 Re: building a great mineral collection? (Peter Lemkin)
20 Feb-08:39:55 Re: building a great mineral collection? (Rob Schnerr)
20 Feb-07:47:33 Re: building a great mineral collection? (Tobi)

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Author Message
  Topic: Researcher Identity
RayStraw

Replies: 2
Views: 172

PostForum: Off-Topic and Introductions   Posted: Feb 19, 2020 18:21   Subject: Re: Researcher Identity
Sounds like Lawrence M. (Larry) Anovitz...he's at Oak Ridge National Laboratories

Thanks Peter. This is the correct person I'm looking for.

Ray Straw
  Topic: Researcher Identity
RayStraw

Replies: 2
Views: 172

PostForum: Off-Topic and Introductions   Posted: Feb 19, 2020 16:55   Subject: Researcher Identity
A friend at the recent Tucson show told me about a collector/researcher interested in buying pseudomorph crystals. I believe he planned to section the crystals to study the progress/mechanism of the ...
  Topic: Tucson Show 2020
RayStraw

Replies: 93
Views: 20082

PostForum: News about shows   Posted: Jan 24, 2020 15:53   Subject: Re: Tucson Show 2020
I have some ideas about using user posters to help fundraising for FMF or other mineral groups.

I'll be in Tucson from January 30 thru February 4.

Could we meet if you are available with those d ...
  Topic: Color variation in azurite and malachite
RayStraw

Replies: 10
Views: 1466

PostForum: Minerals and Mineralogy   Posted: Nov 05, 2019 14:00   Subject: Re: Color variation in azurite and malachite
Alfredo:

Thank you for your insight.

Ray Straw
  Topic: Color variation in azurite and malachite
RayStraw

Replies: 10
Views: 1466

PostForum: Minerals and Mineralogy   Posted: Nov 05, 2019 12:51   Subject: Re: Color variation in azurite and malachite
John:

Thanks for the summary of your work with Argentine rhodocrosite.

I have just found a paper on optical behavior of commercial paint pigments--14. (Gueli, Anna, Bonfiglio, Guido, Pasquale, S ...
  Topic: Color variation in azurite and malachite
RayStraw

Replies: 10
Views: 1466

PostForum: Minerals and Mineralogy   Posted: Nov 03, 2019 09:29   Subject: Re: Color variation in azurite and malachite
Thanks for the beautiful Bisbee picture and the color difference explanation.

I do not want to compare azurite with malachite.

For just malachite in the specimen I believe the shade represents t ...
  Topic: Color variation in azurite and malachite
RayStraw

Replies: 10
Views: 1466

PostForum: Minerals and Mineralogy   Posted: Nov 02, 2019 11:59   Subject: Re: Color variation in azurite and malachite
Thank you for the information. I can use the reference for other problems I have.

I was not clear in what I wanted.

Botyroidal malachite often has different shades of green.

Botyroidal azuri ...
  Topic: Color variation in azurite and malachite
RayStraw

Replies: 10
Views: 1466

PostForum: Minerals and Mineralogy   Posted: Nov 01, 2019 19:48   Subject: Color variation in azurite and malachite
Can anyone provide a reference to the cause(s) of color variation in layers of botyroidal azurite and malachite.

I think it is due to the size of the micro crystals.

Thanks for the information
...
  Topic: Pyrrhotite Herja?
RayStraw

Replies: 5
Views: 1012

PostForum: What is it? - Where is it from?   Posted: Oct 20, 2019 06:48   Subject: Re: Pyrrhotite Herja?
May be pyrite.

Check with a magnet. Pyrrhotite is magnetic, Pyrite is not.

Hope this helps.

Ray
  Topic: Posters
RayStraw

Replies: 7
Views: 1636

PostForum: Minerals and Mineralogy   Posted: Aug 21, 2019 07:40   Subject: Re: Posters
Hi Ray,

feel free to save my collages from the FMF forum. I think this site scales the pictures down so if you want them in original resolution, you can give me your e-mail address.

Regards
Tob ...
  Topic: Posters
RayStraw

Replies: 7
Views: 1636

PostForum: Minerals and Mineralogy   Posted: Aug 20, 2019 14:32   Subject: Re: Posters
Thanks for the response.

Could you share one of collages? Say the one with Quartz.

I'll get a copy of Microsoft Paint.

Best regards,
Ray Straw
  Topic: Posters
RayStraw

Replies: 7
Views: 1636

PostForum: Minerals and Mineralogy   Posted: Aug 20, 2019 09:52   Subject: Re: Posters
That is exactly what I was looking for.

Are you interested in sharing a template together with brief instructions? These would be a good way for FMF members to share collections or stories involvi ...
  Topic: Posters
RayStraw

Replies: 7
Views: 1636

PostForum: Minerals and Mineralogy   Posted: Aug 20, 2019 06:53   Subject: Posters
Sometime within the past few months I saw what looked like a poster of multiple quartz specimens. There were several posters posted.

Can anyone point me to one of these posters?

Thank you,

R ...
  Topic: Milpillas "Electric Blue" Azurites AND Malachites - Natural or Chipped?
RayStraw

Replies: 20
Views: 10135

PostForum: Incorrect classification and fakes   Posted: Aug 06, 2019 22:12   Subject: Re: Milpillas "Electric Blue" Azurites AND Malachites - Natural or Chipped?
Thank you for your take on this issue.

Ray Straw
  Topic: Milpillas "Electric Blue" Azurites AND Malachites - Natural or Chipped?
RayStraw

Replies: 20
Views: 10135

PostForum: Incorrect classification and fakes   Posted: Aug 04, 2019 09:52   Subject: Re: Milpillas "Electric Blue" Azurites AND Malachites - Natural or Chipped?
Bob:

I have examined the specimen pictured and believe the reflections on top are all remnants of the original azurite crystal because all contain steps parallel to the other relected azurites. Th ...
  Topic: Malachite
RayStraw

Replies: 3
Views: 1600

PostForum: What is it? - Where is it from?   Posted: Jun 18, 2019 08:03   Subject: Re: Malachite
Thank you for your insight.

Ray
  Topic: Malachite
RayStraw

Replies: 3
Views: 1600

PostForum: What is it? - Where is it from?   Posted: Jun 17, 2019 17:54   Subject: Malachite
The attached malachite consists entirely of parallel rods.

I believe that this may be a pseudomorph after azurite.

Does anyone have a specimen like this with some remnant azurite on the surface ...
  Topic: Stability of Azurite vs Malachite
RayStraw

Replies: 23
Views: 4712

PostForum: Minerals and Mineralogy   Posted: Jun 12, 2019 11:31   Subject: Re: Stability of Azurite vs Malachite
Bob:

I believe that the reflections in your picture are indicative of the original azurite surface but portions removed due to the pseudo morphing process. I believe it is very unlikely that isola ...
  Topic: Stability of Azurite vs Malachite
RayStraw

Replies: 23
Views: 4712

PostForum: Minerals and Mineralogy   Posted: Jun 07, 2019 12:34   Subject: Re: Stability of Azurite vs Malachite
Thank you everyone for your insights.

I will consider these thoughts in my forthcoming paper of azurite to malachite pseudomorphs.

Best regards,
Ray Straw
  Topic: Stability of Azurite vs Malachite
RayStraw

Replies: 23
Views: 4712

PostForum: Minerals and Mineralogy   Posted: Jun 06, 2019 10:37   Subject: Re: Stability of Azurite vs Malachite
Go on Google and search: "stability relations of malachite and azurite"
An article by B.W. Vink, MINERALOGICAL MAGAZINE, MARCH 1986, VOL. 50, PP. 41-7, will show.

The paper does a good ...
 
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