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The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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| Search found 16 matches |
| Author | Message |
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 Topic: Pseudomorph chemistry - (40) |
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| Daniel Garcia Replies: 28 Views: 33836 |
 Forum: Featured Columns of FMF Posted: Aug 31, 2022 01:02 Subject: Re: Pseudomorph chemistry - (40) |
| Hi everybody,
Thanks, Cesar, for this expanded picture of the stability relationships in the H2O O2 CO2 SO4 CuO system. I have two questions and a suggestion. (1) Which is the thermodynamic databa ... |
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| Topic: Pseudomorph chemistry - (40) |
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| Daniel Garcia Replies: 28 Views: 33836 |
Forum: Featured Columns of FMF Posted: Aug 29, 2022 08:15 Subject: Re: Pseudomorph chemistry - (40) |
| Thanks Roger, for this nice "macro" case.
It seems to me that in the dotted area of your last picture, the termination of the malachite cristals simply mimic the striated outer shape of the ... |
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| Topic: Pseudomorph chemistry - (40) |
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| Daniel Garcia Replies: 28 Views: 33836 |
Forum: Featured Columns of FMF Posted: Aug 28, 2022 13:43 Subject: Re: Pseudomorph chemistry - (40) |
| Thanks Roger
Here is the same view under normal light. Azurite is still blue. It seems to be one single crystal, that inherits its shape from the pore geometry. Some other pores in the same sectio ... |
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| Topic: Pseudomorph chemistry - (40) |
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| Daniel Garcia Replies: 28 Views: 33836 |
Forum: Featured Columns of FMF Posted: Aug 28, 2022 05:45 Subject: Re: Pseudomorph chemistry - (40) |
| Here is a thin section of a porous rock (mostly quartz) with pore filling azurite (blue) being partly converted to malachite (fibers). Looks similar to some of the Tsumeb specimens previously posted o ... | |
| Topic: Pseudomorph chemistry - (40) |
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| Daniel Garcia Replies: 28 Views: 33836 |
Forum: Featured Columns of FMF Posted: Aug 20, 2022 11:11 Subject: Re: Pseudomorph chemistry - (40) |
| Hello Daniel
I am obviously interested in additional information. Can you give your opinion on the azurite – malachite transformation? I assume that the phenomenon of pseudomorphosis is more common ... |
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| Topic: Pseudomorph chemistry - (40) |
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| Daniel Garcia Replies: 28 Views: 33836 |
Forum: Featured Columns of FMF Posted: Aug 18, 2022 14:42 Subject: Re: Pseudomorph chemistry - (40) |
| Sorry, but Im not currently able to attach a pdf file to my personal messages.... | |
| Topic: Pseudomorph chemistry - (40) |
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| Daniel Garcia Replies: 28 Views: 33836 |
Forum: Featured Columns of FMF Posted: Aug 18, 2022 03:42 Subject: Re: Pseudomorph chemistry - (40) |
| Hello Daniel
I am obviously interested in additional information. Can you give your opinion on the azurite – malachite transformation? I assume that the phenomenon of pseudomorphosis is more common ... |
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| Topic: Pseudomorph chemistry - (40) |
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| Daniel Garcia Replies: 28 Views: 33836 |
Forum: Featured Columns of FMF Posted: Aug 18, 2022 02:04 Subject: Re: Pseudomorph chemistry - (40) |
| "Superb reference"
Indeed, one of my top ten geoscience papers. A copy is available upon request by MP. Pseudomorphism, and more generally mineral replacement is a fascinating topic. ... |
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| Topic: Pseudomorph chemistry - (40) |
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| Daniel Garcia Replies: 28 Views: 33836 |
Forum: Featured Columns of FMF Posted: Aug 14, 2022 12:49 Subject: Re: Pseudomorph chemistry - (40) |
| Hi all
You may find some answers and a general overview about the chemical aspects of mineral replacement reactions in the paper by A. Putnis. Mineralogical Magazine, October 2002, Vol. 66(5), pp. ... |
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| Topic: How long does it take for a crystal to form? |
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| Daniel Garcia Replies: 13 Views: 8243 |
Forum: 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 ... |
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| Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula |
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| Daniel Garcia Replies: 6 Views: 4721 |
Forum: 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 |
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| Daniel Garcia Replies: 6 Views: 4721 |
Forum: 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 ... |
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| Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula |
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| Daniel Garcia Replies: 6 Views: 4721 |
Forum: 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 ... |
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| Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula |
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| Daniel Garcia Replies: 6 Views: 4721 |
Forum: 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 ... |
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| Topic: Elbaite, ending moor's head |
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| Daniel Garcia Replies: 9 Views: 7110 |
Forum: 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 |
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| Daniel Garcia Replies: 501 Views: 570672 |
Forum: 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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