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Keystoneite from
Keystone Mine, Magnolia Mining District, Boulder Co., Colorado, USA

Locality type:Mine
Formula:Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Comments:Golden yellow. Admantine luster. Radiating sprays & parallel growth aggregates of hexagonal, aciciular xls. Ave. size of xls: 0.2 x 0.02 x 0.02 mm.
Validity:Valid - Type Locality
References:"Minerals of Colorado, updated & revised", p. 289, by Eckel, Edwin B., 1997; CNMNC Newsletter 53, Eur. J. Mineral., 32, https://doi.org/10.5194/ejm-32-209-2020, 2020.
Mineral Data:Click here to view Keystoneite data
Locality Data:Click here to view Keystone Mine, Magnolia Mining District, Boulder Co., Colorado, USA
Nearest other occurrences of Keystoneite
0.3km (0.2 miles) Mountain Lion Mine - Keystone vein, Magnolia Mining District, Boulder Co., Colorado, USA
Mineral and/or Locality  
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