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Newest topics and users posts
04 Jul-15:41:39 The mizunaka collection - chrysocolla (Am Mizunaka)
04 Jul-11:31:17 Re: collection of michael shaw (Michael Shaw)
04 Jul-08:25:59 Re: the mim museum in beirut, lebanon (Mim Museum)
04 Jul-07:22:13 Re: collection of volkmar stingl (Volkmar Stingl)
04 Jul-04:00:39 Re: new generation for picture - ploum (Tobi)
03 Jul-11:46:17 Re: nature used 57 recipes to create earth's ~10,500+ minerals! (Peter Lemkin)
03 Jul-11:31:17 Nature used 57 recipes to create earth's ~10,500+ minerals! (Peter Lemkin)
03 Jul-09:43:04 Re: collection of michael shaw (Michael Shaw)
03 Jul-06:04:41 Re: new generation for picture - ploum (Ploum)
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)

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  Topic: How long does it take for a crystal to form?
Daniel Garcia

Replies: 13
Views: 942

PostForum: Minerals and Mineralogy   Posted: May 30, 2022 11:49   Subject: Re: How long does it take for a crystal to form?
There are many textbooks about this, in a field named "chemical engineering science"
The question you ask is also crucial to many industrial applications, including the growth rate of pharm ...
  Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula
Daniel Garcia

Replies: 6
Views: 622

PostForum: Minerals and Mineralogy   Posted: May 16, 2022 08:20   Subject: Re: Help with mineral identification in thin section from Khibiny, Kola peninsula
I don't know if the colour and pleochroism are diagnostic, but your images certainly "look" like those in MacKenzie & Guilford, including one with an acute termination. What else might t ...
  Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula
Daniel Garcia

Replies: 6
Views: 622

PostForum: Minerals and Mineralogy   Posted: May 16, 2022 03:20   Subject: Re: Help with mineral identification in thin section from Khibiny, Kola peninsula
Thanks Duncan, good idea

In my textbooks too, aenigmatite is said to have a strong pleochroism, but often obscured by the color. It is classified as "nearly opaque" by W.E. Troger.
Indee ...
  Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula
Daniel Garcia

Replies: 6
Views: 622

PostForum: Minerals and Mineralogy   Posted: May 14, 2022 15:59   Subject: Re: Help with mineral identification in thin section from Khibiny, Kola peninsula
Hi Pete

I'm not familiar with the forum desk, hence my first picture was discarded. Second try.

Like previously, the green laths are aegirine, the clear groundmass is nepheline and the orange la ...
  Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula
Daniel Garcia

Replies: 6
Views: 622

PostForum: Minerals and Mineralogy   Posted: May 14, 2022 10:40   Subject: Help with mineral identification in thin section from Khibiny, Kola peninsula
Hi

I'm trying to identify some rare minerals in thin sections from urtites collected in Khibiny in 2005. Maybe somebody is familiar with these minerals.

In these pictures, the clear groundmass ...
  Topic: Elbaite, ending moor's head
Daniel Garcia

Replies: 9
Views: 1178

PostForum: Minerals and Mineralogy   Posted: May 13, 2022 13:18   Subject: Re: Elbaite, ending moor's head
This question brings up another, which is why do tourmaline crystals often vary in color along their lengths? One normally thinks that crystals grow outward from a "seed", which explains ph ...
  Topic: Presentation of new members - Reference Thread
Daniel Garcia

Replies: 455
Views: 398021

PostForum: Off-Topic and Introductions   Posted: May 04, 2022 02:23   Subject: Presentation of new members - Daniel Garcia from Narbonne, France
Hi everybody

I dont know what is the right way to introduce myself, but as a newby I wanted to share some details about my experience and my fields of interest.
I started my profesional experience ...
 
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