Formula: PbO2
Origin of name: for K. Plattner, German metallurgist
Crystal system: tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: crystals black, massive material brownish black to iron-black
Diaphaneity: opaque
Luster: metallic adamantine, becomes dull on exposure
Habit: crystals slender prismatic, elongated along c-axis, masses, nodular or botryoidal, dense to fibrous, large size
Hardness: 5.5
Specific gravity: 9.42
Cleavage: none
Tenacity:
Streak: brown
Synonyms/varieties:
Comments: dimorphous with scrutinyite
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