Formula: Pb2Ca6Mn(Si6O18)(SO4)2(OH)2.4H2O
Origin of name: for Washington Roebling, American civil engineer and mineral collector
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: white, pink
Diaphaneity: translucent
Luster: dull to somewhat resinous
Habit: crystals prismatic, minute, in compact masses, fibrous or platy
Hardness: 3
Specific gravity: 3.43
Cleavage: 2; {001} perfect, {100} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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