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RM3690   Boltwoodite
(K,Na)(UO₂)(SiO₃OH)·1.5H₂O
  -  9. Silicates

A beautiful radial aggregate of boltwoodite crystals, from this classic locality for the species. Good luster and intense color. The original label reads Rössing mine, but they were mislabeled at the time.

Size: 5.5 x 5 x 4 cm.
Main crystal: 11 mm.
Presents radioactive activity ☢.
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