Formula: NaCa2(Zr,Nb)Si2O7(O,OH,F)2
Origin of name: Named for Friedrich Wohler (1800-1882), German chemist, Gottingen, Germay.
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 10.8, b = 10.26, c = 7.26, β = 108.95°
Colour: Light yellow to dark yellow, gray, brown
Diaphaneity: Transparent to translucent
Luster: Vitreous to greasy or dull
Habit: Crystals prismatic or tabular, irregular grains to 3 cm, twinned
Hardness: 5.5 to 6
Specific gravity: 3.41 to 3.44
Cleavage: 3; {010} distinct, {100} and {110} indistinct
Tenacity: Brittle
Streak: Yellowish-white, pale yellow
Synonyms/varieties:
Comments:
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