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Here is a gemmy, vibrant green tourmaline with a remarkable feature on the termination: sunken trian.....
Sillimanite is an unusual alumino-silicate mineral that is uncommon on the mineral market. This spec.....
The crystals on this specimen of sillimanite are up to .65" long and are a pretty light blue color. .....
Here is a fine specimen of sillimanite from New Hampshire, where a friend of mine collects these cry.....
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