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RM3698   Thorianite
ThO₂
  -  4. Oxides and hydroxides

From this classic locality for the species belongs this group of thoryanite crystals, cubic with octahedral shapes at the vertices, twinned and interpenetrated, good size, intense black color, and luster. Thorianite is a thorium oxide, almost always containing some uranium, the variety being uranothorianite.

Size: 15 x 12 x 11 mm.
Main crystal: 8 mm.
Presents radioactive activity ☢.
Reserved