Sillimanite
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Sillimanite or fibrolite is an aluminosilicate mineral with the chemical formula Al2SiO5. Sillimanite is named after the American chemist Benjamin Silliman. It was first described in 1824 for an occur
Sillimanite k 302a
Silimanite crystal from Sri Lanka
Fibrolite micrograph
Kyanite
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Kyanite is a typically blue aluminosilicate mineral, found in aluminium-rich metamorphic pegmatites and sedimentary rock. It is the high pressure polymorph of andalusite and sillimanite, and the prese
Sillimanite
…1824 for an occurrence in Chester, Connecticut. Sillimanite or fibrolite is one of three aluminosilicate polymorphs, the other two being andalusite and kyanite. A common variety of sillimanite is known as fibrolite, so named because the mineral appears like a bunch of fibres twisted together when viewed in…
Kyanite crystals
Deep blue kyanite
Kyanite within quartz, Hunterian Museum, Glasgow
18K gold earrings with drop-shaped kyanites.