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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.....
This is a piece of grayish brown mica schist that is peppered with light blue sillimanite crystals t.....
A friend of mine lives on Hell Hill in southern New Hampshire, where he collected this specimen of s.....
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