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MD-231845
Sillimanite
Thumbnail, 1.8 x 0.9 x 0.4 cm
Mogok, Sagaing District, Mandalay Division, Burma (Myanmar)
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Sillimanite is a high temperature and high pressure aluminum silicate found in high-grade regional metamorphic rocks. Transparent crystals are called "fibrolite" by gemologists. This is a gemmy, fine, lavender, elongate crystal with a bit of rounding. The edge rounding likely represents resorption into the matrix more than stream wear. This example from Mogok, Burma is sharper than most. 7.22 carats.