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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Sodalite (Hackmanite) - Afghanistan
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SKU: MSW1490
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A piece of nicely tenebrescent hackmanite from Afghanistan.These sodalite hackmanite specimens also display an incredible phosphorescence.
Hackmanite is a pink to greyish-white, lavender to white variety of sodalite. Sulfur replaces some of the chlorine atoms in the sodalite structure. The sulfur content can give sodalite reversible photochromism or tenebrescence. The fluorescent community reserves the name hackmanite for tenebrescent sodalites.
Below is an excerpt from the Journal of the Fluorescent Mineral Society, Volume 39 - “Hackmanite all fluoresce orange in longwave UV light. All of the hackmanites have strong and long-lasting white afterglow after exposure to shortwave UV light. Strong, long-lasting dark purple tenebrescence is associated with these hackmanite specimens. The tenebrescence is very long lasting. It takes several hours under a strong halogen light to reverse the tenebrescence.”
"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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