Formula: Pb(U+4,U+6)(Ti,Fe+2,Fe+3)20(O,OH)38
Origin of name: For the type locality, Cleuson Lake area, Nendaz Valley, Wallis (Valais), Switzerland
Crystal system: Trigonal
Crystal class: 3
Twinning: generally occurring
Unit cell: a = 10.576, c = 21.324
Colour: Black
Diaphaneity: Opaque
Luster: Submetallic
Habit: Multiple rhombohedra and hexagonal prisms
Hardness:
Specific gravity: 4.74-4.93
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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