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
Andalusite
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Andalusite is an aluminium nesosilicate mineral with the chemical formula Al2SiO5. This mineral was called andalousite by Delamétherie, who thought it came from Andalusia, Spain. It soon became clear
Sillimanite
…described in 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…
Andalusite
Round faceted andalusite