Gem Sillimanite xl (7.22 carats)

Item Description

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. The only other fibrolite we offered at auction, over a year ago, was just over 5 carats and sold for over $300. RARE on the market in this size and quality.