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Roger Warin Replies: 6 Views: 553 |
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Since no one answers, because the photos are not expressive, I suggest that it is the same previous habit in which the prism has disappeared.
This calcite would therefore only be made of the rhombohe ... |
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Roger Warin Replies: 6 Views: 553 |
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Hello,
These crystals are short prisms m{10-10 } with a classical termination e{01-12}}. Often it's the other way around, with the prism dominating and the rhombohedral termination only appearing lat ... |
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Roger Warin Replies: 11 Views: 1115 |
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About Minrecordite and about light
Hello I bought this beautiful Minrecordite sample in 1984. It is type A. I don't know what that means. The tiny rhombohedrons of minrecordite surround splendid d ... |
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Roger Warin Replies: 36 Views: 6089 |
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The name forsterite is restricted to those species with no more than 10 percent magnesium substituting for iron. Compositions intermediate to these series end-members are identified which is an expres ... | |
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Roger Warin Replies: 36 Views: 6089 |
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Still on the subject of olivines and their solid solutions.
I say this because I know the world of amateurs, having run a club for over 50 years. We're an interphase between scientists and beginners. ... |
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Roger Warin Replies: 36 Views: 6089 |
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Hello Herwig,
Thank you for giving me your opinion, which is very respectable since it's the official standard. By profession, I've always been on the frontiers of knowledge. But of course my opinio ... |
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Roger Warin Replies: 36 Views: 6089 |
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Please help me.
After 70 years of collecting, I no longer know how to write a label for this automorphic mineral, whose face indices I have noted. I think I've reached a good level of mineralogical ... |
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Roger Warin Replies: 36 Views: 6089 |
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Thank you, Alfredo,
My comment concerns the IMA, whose scientific rigor, obviously necessary, sometimes bewilders the amateur. Scientists obviously have a background. It seems to me that there is a ... |
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Roger Warin Replies: 36 Views: 6089 |
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Isn't IMA, limonite, a rock and not a mineral species? | |
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Roger Warin Replies: 36 Views: 6089 |
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Hello,
I believe in a pseudomorphosis of a garnet. The texture of this specimen is not that of a crystal. I think we often forget that water is an extracting agent of SiO2. Obviously the water mus ... |
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Roger Warin Replies: 23 Views: 2725 |
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Some bubbles and Sclieren in LDG. © R. Warin.
BLACK VEILS : This phase presents traces of siderophile elements including iridium, osmium, platinoids, which form black veils during drying. In ... |
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Roger Warin Replies: 23 Views: 2725 |
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OTHER CURIOSITIES: - SCHLIEREN – BUBBLES - SPACE MATERIAL
As for Schlieren, they result from an optical phenomenon highlighting the local contractions and decompressions of the gel in its flow whic ... |
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Roger Warin Replies: 23 Views: 2725 |
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Note that cristobalite spherulites with semi-crystalline phases are similar to those observed in crystallography of (bio)polymers. | |
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Roger Warin Replies: 23 Views: 2725 |
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I was surprised when I found on my photo the Maltese cross that I had already shown you in my photos of luxulianite (UK).
Indeed, spherulites have particular optical properties. Thus, observed under ... |
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Roger Warin Replies: 23 Views: 2725 |
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The LDG precursor gel obviously contains traces of the signature of celestial bodies (astrophysicists' famous dark dust). This dark matter is comparable to the very primitive cold carbonaceous chondri ... | |
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