Sapphire

Colour: Blue
Lustre: Vitreous to bright vitreous
Moh’s Hardness: 9
Clevage: Occurs parallel to the basal and rhombohedral faces
Crystal System: Trigonal
Double refraction: 1.76 to 1.78
Pleochroism: Uniaxal

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One thought on “Sapphire

  1. Pingback: Stumped. | Ruby & Mahogany

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