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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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RM1455   Boltwoodite with calcite
(K,Na)(UO₂)(SiO₃OH)·1.5H₂O
  -  9. Silicates

A elongated vug lined with small calcite crystals on which are scatterd some radial clusters of acicular yellow to orange crystals of boltwoodite. This specimen is labeled as Rössing mine but during many years excellent boltwoodite samples were labeled as "Rössing" and thus confused with the Rössing Uranium mine in the area (which never produced any boltwoodite specimens). The correct locality is Goanikontes, a uranium claim 4 km SE of Goanikontes and 27 km E of Swakopmund, at a distance of 40 km from the Rössing Uranium Mine.

Size: 5.3 x 4.3 x 3.0 cm.
Main crystal: 4 mm.
Found in 1990's
Fluorescent under long wave UV
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