Formula: MgAlBO4
Origin of name: from Sanskrit Sinhala = Sri Lanka
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 9.874 Å, b = 5.671 Å, c = 4.335 Å
Colour: colourless, yellow to dark brown, greenish brown, light pink
Diaphaneity:
Luster: vitreous
Habit: massive, rounded grains
Hardness: 6.5 to 7 (approximate)
Specific gravity: 3.48 to 3.50
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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