Metauranocircite - Annie Creek, South Dakota
Contributed by: Mark Cole
Date: Mar 29th, 2026
Locality: Annie Creek, Bald Mountain Mining District (Portland Mining District), Lawrence County, South Dakota, USA (See on Mindat)
Description:
Originally posted by Mark Cole on Nature's Rainbows in 2015.
Summary of luminescence responses:
Metauranocircite (Mindat) (RRUFF)
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Green