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25 Oct-07:01:21 Re: new generation for picture - ploum (Ploum)
25 Oct-06:02:47 Re: new generation for picture - ploum (Ploum)
25 Oct-01:41:28 Re: collection of michael shaw (Tobi)
25 Oct-01:37:51 Re: collection of sante celiberti (Tobi)
25 Oct-01:34:43 Re: silvia's collection (Tobi)
25 Oct-01:32:18 Re: don lum collection (Tobi)
25 Oct-01:26:48 Re: collection of tobi (Tobi)
24 Oct-23:42:01 Re: collection of volkmar stingl (Volkmar Stingl)
24 Oct-21:41:08 Re: don lum collection (Don Lum)
24 Oct-21:40:15 Re: the mizunaka collection - quartz (Am Mizunaka)
24 Oct-20:05:46 Silvia's collection - huge siderite (Silvia)
24 Oct-19:57:24 Re: the mizunaka collection - quartz (Silvia)
24 Oct-18:44:45 The mizunaka collection - quartz (Am Mizunaka)
24 Oct-15:15:23 Re: collection of sante celiberti (Sante Celiberti)
24 Oct-14:52:30 Re: collection of michael shaw (Michael Shaw)
24 Oct-13:43:08 Re: collection of michael shaw (Silvia)
24 Oct-11:17:10 Re: collection of michael shaw (Michael Shaw)
24 Oct-09:37:12 Re: collection of volkmar stingl (Volkmar Stingl)
24 Oct-09:28:16 Re: collection of michael shaw (Volkmar Stingl)
24 Oct-09:04:01 Re: collection of michael shaw (Michael Shaw)
24 Oct-03:54:43 Re: collection of tobi (Dany Mabillard)
24 Oct-03:50:24 Re: collection of tobi (Tobi)
23 Oct-23:28:11 Re: help found with items (Philippe Durand)
23 Oct-15:08:16 Silvia's collection - classic portugese ferberite (Silvia)
23 Oct-13:59:45 Re: help found with items (Lou B.)

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  Topic: Malachite twinning
RayStraw

Replies: 5
Views: 11500

PostForum: Minerals and Mineralogy   Posted: Mar 08, 2020 06:50   Subject: Re: Malachite twinning
Thank you.

I bought and downloaded the paper.

Ray
  Topic: Azurite to Malachite pseudomorph research
RayStraw

Replies: 14
Views: 17661

PostForum: Forum questions   Posted: Mar 06, 2020 10:23   Subject: Re: Azurite to Malachite pseudomorph research
This specimen from Roger Warin is just what I need for my azurite to malachite pseudomorph research (Malachite-psm-aurite_R.jpg):
Azurite crystal with chipped termination and malachite pseudomo ...
  Topic: Malachite twinning
RayStraw

Replies: 5
Views: 11500

PostForum: Minerals and Mineralogy   Posted: Mar 04, 2020 12:29   Subject: Malachite twinning
Someone claimed that all malachite is twinned.

Does anyone know of any discussion or papers to this effect?

Best,

Ray
  Topic: Azurite to Malachite pseudomorph research
RayStraw

Replies: 14
Views: 17661

PostForum: Forum questions   Posted: Feb 27, 2020 10:09   Subject: Re: Azurite to Malachite pseudomorph research
Roger:

This Tsumeb pseudomorph appears to be about 3cm maximum. Is that correct?

Is it still in your collection?

Best,
Ray Straw
  Topic: Azurite to Malachite pseudomorph research
RayStraw

Replies: 14
Views: 17661

PostForum: Forum questions   Posted: Feb 27, 2020 10:05   Subject: Re: Azurite to Malachite pseudomorph research
Thanks everyone for your interpretations of azurite to malachite pseudomorphs.

All the information will be distilled and included in my paper.


Best,
Ray Straw
  Topic: Azurite to Malachite pseudomorph research
RayStraw

Replies: 14
Views: 17661

PostForum: Forum questions   Posted: Feb 25, 2020 11:10   Subject: Re: Azurite to Malachite pseudomorph research
Roger:

The partial pseudomorph would be ideal for my purposes which will involve cutting sections of the crystal.

Please advise specimen dimensions.

Thank you,

Ray

rsplinters(@)gmail do ...
  Topic: Azurite to Malachite pseudomorph research
RayStraw

Replies: 14
Views: 17661

PostForum: Forum questions   Posted: Feb 24, 2020 10:00   Subject: Azurite to Malachite pseudomorph research
I am still working on my paper which attempts to explain how malachite replaces azurite to form a pseudomorph where the azurite shape and faces are present but only malachite remains.

1. What I ne ...
  Topic: Researcher Identity
RayStraw

Replies: 2
Views: 6624

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: 6624

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: 104
Views: 89200

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: 9927

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: 9927

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: 9927

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: 9927

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: 9927

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: Posters
RayStraw

Replies: 7
Views: 9443

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: 9443

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: 9443

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: 9443

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: 28176

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
 
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