Formula: V1-xS.n(Mg,Al)(OH)2
Origin of name: for Nikolai Pavlovich Yushkin (1936-), Russian mineralogist
Crystal system: Trigonal
Crystal class: 3m
Twinning:
Unit cell: a = 3.21, c = 11.3
Colour: Red-lilac to pinkish gray in thin fragments, violet
Diaphaneity: Opaque
Luster: Metallic
Habit: Flaky or scaly, in aggregates 2 to 8 mm across
Hardness: <1
Specific gravity: 2.94
Cleavage: None
Tenacity: Plastic
Streak: Reddish gray
Synonyms/varieties:
Comments:
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