Formula: KLiFeAl(AlSi3)O10(F,OH)2
Origin of name: locality Zinnwald, Czech Republic
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 5.27 Å, b = 9.187 Å, c = 20.02 Å, β = 101°
Colour: Gray, brown, dark green
Diaphaneity: Transparent
Luster: Vitreous, pearly on cleavage
Habit: Crystals short prismatic or tabular; scaly aggregates or disseminated scales, micaceous, pseudo-hexagonal
Hardness: 2.5 to 4
Specific gravity: 2.9 to 3.3
Cleavage: 1; {001} perfect, micaceous
Tenacity: Uneven fracture
Streak: White
Synonyms/varieties:
Comments:
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