Formula: Pb6(SO4)F10
Origin of name: from Greek pseudo = false and grandreefite
Crystal system: orthorhombic
Crystal class: 222
Twinning:
Unit cell:
Colour: colourless
Diaphaneity: transparent
Luster: subadamantine
Habit: square (pseudotetragonal) tabular crystals form aggregates to 4 mm
Hardness: 2.5
Specific gravity: 7.01
Cleavage: none
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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