Formula: CaPbAl3(Si2O7)(SiO4)(O,OH)
Origin of name: For E. Hancock, American collector
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 9.03 Ǻ, b = 5.62 Ǻ, c = 10.29 Ǻ, β = 115.9°
Colour: Crystals yellowish brown; masses brownish-red, dull
Diaphaneity:
Luster: Vitreous
Habit: Crystals lath-shaped, vertically striated, faces rounded with epidote habit; masses, compact; drusy cellular aggregates
Hardness: 6 to7
Specific gravity: 4.03
Cleavage: 1; {001} perfect
Tenacity: Uneven; brittle
Streak:
Synonyms/varieties:
Comments:
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