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15 Aug-10:01:33 Re: the tama higuchi collection (Tamahiguchi)
14 Aug-20:36:52 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)
14 Aug-18:59:26 Re: don lum collection (Don Lum)
14 Aug-17:40:16 Re: dynamics involved in quartz forming hexagonal rings? (Eck Noch)
14 Aug-17:37:12 Re: dynamics involved in quartz forming hexagonal rings? (Eck Noch)
14 Aug-17:23:02 The mizunaka collection - quartz (Am Mizunaka)
14 Aug-17:07:47 Re: dynamics involved in quartz forming hexagonal rings? (Donn C.)
14 Aug-17:06:03 Re: dynamics involved in quartz forming hexagonal rings? (Bob Morgan)
14 Aug-16:51:22 Re: pseudomorph chemistry (Jordi Fabre)
14 Aug-16:07:36 Re: collection of firmo espinar (Firmo Espinar)
14 Aug-15:12:48 Re: dynamics involved in quartz forming hexagonal rings? (Eck Noch)
14 Aug-14:34:58 Re: dynamics involved in quartz forming hexagonal rings? (Eck Noch)
14 Aug-13:50:14 Re: pseudomorph chemistry (Roger Warin)
14 Aug-13:29:29 Dynamics involved in quartz forming hexagonal rings? (Donn C.)
14 Aug-12:49:00 Re: pseudomorph chemistry (Daniel Garcia)
14 Aug-10:42:17 Re: twinned topaz? (Yannick Cosson)
14 Aug-09:40:20 Re: collection of volkmar stingl (Volkmar Stingl)
14 Aug-08:57:33 Re: pseudomorph chemistry (Roger Warin)
14 Aug-04:44:55 Re: new generation for picture - ploum (Ploum)
14 Aug-02:34:28 Re: pseudomorph chemistry (Peter Lemkin)
13 Aug-14:27:19 Re: tama's mineral paintings (Silvia)
13 Aug-12:21:29 Pseudomorph chemistry (Raystraw)
13 Aug-11:19:27 Re: tama's mineral paintings (Tony L. Potucek)
13 Aug-07:19:57 Re: dragon stone / septarian concretion (Pete Richards)
13 Aug-07:05:40 Re: dragon stone / septarian concretion (James Catmur)

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  Topic: Pseudomorph chemistry
RayStraw

Replies: 5
Views: 266

PostForum: Minerals and Mineralogy   Posted: Aug 13, 2022 12:21   Subject: Pseudomorph chemistry
I have a 11cm high broken azurite which shows internal growth of botryoidal malachite.

The rough chemistry requires 2 portions of solid azurite and one portion of liquid water to yield three portio ...
  Topic: Pictures wanted
RayStraw

Replies: 3
Views: 1545

PostForum: Micros & Macros - Images of Minerals   Posted: Jan 31, 2022 17:58   Subject: Pictures wanted
I recently purchased an azurite specimen partially replaced by malachite. The large crystal has malachite on the termination and one of the small crystals is broken showing botyroidal malachite on th ...
  Topic: Canon SLR with stacking
RayStraw

Replies: 14
Views: 3229

PostForum: Off-Topic and Introductions   Posted: Dec 05, 2021 13:37   Subject: Re: Cannon SLR with stacking
Two years ago I saw a demonstration of in camera focus stacking at the Rochester Mineral Symposium.

I bought the reasonable camera Olympus TG-4 and am pleased with the results.

I plan to use the ...
  Topic: Malachite twinning
RayStraw

Replies: 5
Views: 12525

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: 20792

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: 12525

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: 20792

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: 20792

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: 20792

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: 20792

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: 7139

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: 7139

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: 109944

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: 11326

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: 11326

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: 11326

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: 11326

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: 11326

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: 10502

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: 10502

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
 
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