ALEXANDRITE
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ALEXANDRITE
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Alexandrite Facts
Category Mineral
Chemical formula Beryllium aluminium oxide, BeAl2O4
Identification
Color Various shades of green and yellow; brownish, reddish; rarely, blue
Crystal habit slender prisms and tabular form, dimensions are thin in one direction.
Crystal system Orthorhombic 2/m2/m2/m
Twinning Contact and penetration twins common, often repeated forming rosette structures
Cleavage [110] Distinct, [010] Imperfect
Fracture Conchoidal to uneven
Mohs Scale hardness 8.5
Luster Vitreous
Refractive index Biaxial (+) nα=1.745 nβ=1.748 nγ=1.754
Pleochroism Strong in alexandrite
Streak White
Specific gravity 3.5 - 3.84
Major varieties
Alexandrite Color change; green to red
Cymophane Chatoyant