Antimonate, byströmite group
Specific gravity: 5.5 measured, 5.8 calculated
Streak: Light grey
Colour: Bluish grey
Solubility: Dissolves completely in concentrated hydrochloric acid containing KI as a reducing agent (Mindat)
At the type locality, La Fortuna Mine, El Antimonio, Caborca Municipality, Sonora, Mexico, byströmite occurs in quartz veins in an oxidised antimony deposit associated with stibiconite and quartz (HOM).
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