Formula: Pb2CO3O
Origin of name: For David M. Shannon (1942-2004), a mineral dealer who helped collect the first samples of the mineral.
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 9.294, b = 9, c = 5.133
Colour: White
Diaphaneity: Opaque
Luster: Waxy
Habit: Porcelainous, encrustations, platy
Hardness: 3-3.5
Specific gravity: 9.31
Cleavage: None
Tenacity: Brittle, uneven fracture
Streak: White
Synonyms/varieties:
Comments:
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