Formula: Ca2(Mg,Al)6(Si,Al,B)6O20
Origin of name: from old Arabic Serendib = Sri Lanka
Crystal system: triclinic
Crystal class: 1
Twinning: Common, polysynthetic on {0-1-1}
Unit cell: a = 10.043, b = 10.428, c = 8.662, α = 106.37°, β = 96.02°, γ = 124.4°
Colour: Grayish blue-green, blue, dark blue
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Aggregates of irregular grains, massive, as grains to few cm in Tayozhnnoye deposit
Hardness: 6.5 to 7
Specific gravity: 3.42
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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