Formula: Ba2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2.3H2O
Origin of name: for William E. VerPlanck (1916-1963), American geologist, California Division of Mines & Geology.
Crystal system: Hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell: a = 16.398, c = 7.2
Colour: Brownish orange to light brownish yellow
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals prismatic, hexagonal, to 3 mm, radial masses or disseminated grains
Hardness: 2.5 to 3
Specific gravity: 3.52
Cleavage: 2; {11-20} good, {0001} poor or a fracture
Tenacity:
Streak: Pale orange
Synonyms/varieties:
Comments:
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