Formula: PbMnO2(OH)
Origin of name: for Percy Dudgeon Quensel (1881-1966), Swedish mineralogist and petrologist, Stockholm University, Sweden.
Crystal system: Monoclinic
Crystal class: 2
Twinning:
Unit cell: a = 5.61, b = 5.68, c = 9.16, β = 93.3°
Colour: Black, pitch black
Diaphaneity: Opaque
Luster: metallic to adamantine
Habit: crystals tabular, striated on {011}, may be slightly elongated
Hardness: 2.5
Specific gravity: 6.84
Cleavage: 1; {001} perfect
Tenacity: Flexible, somewhat malleable
Streak: Dark brownish gray
Synonyms/varieties:
Comments:
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