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Formula: MgFe3+(SO4)2(OH).7H2O
Hydrated sulphate containing hydroxyl
Crystal System: Monoclinic
Specific gravity: 2.14 measured, 2.23 calculated
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
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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