Quartz Crystals on Calcite - San Antonio Mine, Chihuahua, Mexico
Small delicate crystals of bright green fluorescing quartz are peppered around a matrix of calcite on this striking specimen.
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Scapolite (Marialite), Calcite, Diopside - Afghanistan
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SKU: MSW1538
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Beautiful sphere with a bright yellow marialite crystal in the middle of the pinkish-reddish calcite. Dots of blue diopside add interest.
But what we find fascinating is the tenebrescence (see the animation). We cut this sphere from a big chunk of this material. The marialite was inside the rock. Strongly longwave tenebrescent, which is fairly unusual for tenebrescent minerals.
The question about tenebrescent marialite/scapolite from Afghanistan has always been if it was irradiated. Since this mineral was deep inside the rock would irradiation reached deep enough to affect it? Or is this material naturally tenebrescent?
"Red" Sodalite (Hackmanite) - Deeply Tenebrescent Greenland Mineral
Red sodalite is named for the color it takes on when exposed to sunlight; it is nicely tenebrescent under longwave UV. Under shortwave UV the color deepens, in seconds, to almost black in some areas.
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A Short Study on Rare Occurrences of Apatite from the Ilimaussaq Complex, Greenland
Rarest of the rare from Greenland - apatite has only been observed in a handful of pieces over the decade+ we have been exploring Greenland. Blue apatite crystals fluorescing under UV.
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