Byströmite

bystromite

antimony

stibiconite

quartz

Images

Formula: MgSb⁵⁺₂O₆
Antimonate, byströmite group
Crystal System: Tetragonal
Specific gravity: 5.5 measured, 5.8 calculated
Hardness: 7
Streak: Light grey
Colour: Bluish grey
Solubility: Dissolves completely in concentrated hydrochloric acid containing KI as a reducing agent (Mindat)
Environments

Hydrothermal environments

Localities

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).

Byströmite from La Fortuna Mine - Image

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