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Boltwoodite

Type Locality
Pick's Delta Mine (Delta Mine; Pick's Mine), Delta, San Rafael District (San Rafael Swell), Emery Co., Utah, USA
Mineral Data
(K,Na)(UO2)[HSiO4]·0.5H2O
Strunz: 
9.AK.15
Physical Properties
Crystal System: 
Monoclinic
Streak: 
White
Hardness: 
3.5 - 4.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Boltwoodit