Formula: Na2MgAlF7
Origin of name: for Theobald Weber (1823-1886), a founder of the Danish cryolite industry in 1857.
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 7.06, b = 10, c = 7.303
Colour: Grayish white, greenish gray, white
Diaphaneity: Translucent
Luster: Vitreous
Habit: irregular grains, massive, fine-grained
Hardness: 3.5
Specific gravity: 2.96
Cleavage: 1; {101} poor, {010} indistinct
Tenacity: Uneven fracture
Streak: White
Synonyms/varieties:
Comments:
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