Botryogen

botryogen

pickeringite

copiapite

coquimbite

Images

Formula: MgFe3+(SO4)2(OH).7H2O
Hydrated sulphate containing hydroxyl
Specific gravity: 2.14
Hardness: 2 to 2½
Streak: Ochre yellow
Colour: Light to dark orange-red, pale to dark orange
Solubility: Partially soluble in boiling water, soluble in hydrochloric acid (Mindat)
Common impurities: Zn,Mn
Environments

Hydrothermal environments

Botryogen is a secondary mineral, which may be in great abundance, altered from pyrite, especially in arid climates. Associated minerals include copiapite, amarantite, hohmannite, coquimbite, voltaite, pickeringite, epsomite, gypsum and chalcanthite (HOM).

Localities

At the Terranera mine, Porto Azzurro, Elba Island, Livorno Province, Tuscany, Italy, botryogen occurs with pickeringite and copiapite (Dana).

The type locality is the Falun mine, Falun, Dalarna County, Sweden.

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