Minerals identify

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Sillimanite

Nesosilicate

Kyanite Andalusite Sillimanite ./File:Al2SiO5_phase_diagram.svg Phase diagram of Al2SiO5 (nesosilicates

Sillimanite is an aluminosilicate with the chemical formula Al2SiO5. Sillimanite is named after the American chemist Benjamin Silliman (1779–1864). It was first described in 1824 for an occurrence in Chester , Middlesex County, Connecticut

Identification

Color of mineral

Grey
White
Brown
Yellow
Green
Blue

Mohs scale ( mineral hardness )

7

Density ( specific gravity )

1.653
1.654
1.669

Luster ( interacts light )

Adamantine
Vitreous
Silky

Crystal ( diaphaneity )

Orthorhombic