Formula: Pb2Cl3(OH)
Origin of name: for S. Penfield, American mineralogist
Crystal system: hexagonal
Crystal class: -6
Twinning: common on {0001} about [21-30] axis, contact, on {41-54} contact
Unit cell: a = 11.28 Å, c = 48.65 Å
Colour: colourless, white, yellowish or bluish tinge from impurities
Diaphaneity:
Luster: adamantine to greasy
Habit: crystals prismatic, elongated parallel to c-axis, or steeply pyramidal, or tabular, groups of minute crystals parallel
Hardness:
Specific gravity: 5.82
Cleavage: 1; {0001} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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