Formula: Pb10(SO4)Cl2O8
Origin of name: for Nils Sundius, Swedish mineralogist
Crystal system: monoclinic
Crystal class: 2
Twinning:
Unit cell:
Colour: white to colourless
Diaphaneity:
Luster: adamantine
Habit: crystals platy, to 8 mm, in plumose aggregates
Hardness: 3
Specific gravity: 7.0
Cleavage: 1; {100} perfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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