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Formula: Na3Fe3+(SO4)3.3H2O
Hydrated sulphate
Crystal System: Trigonal
Specific gravity: 2.55 to 2.61 measured, 2.55 calculated
Hardness: 2½
Streak: White
Colour: Colourless, greyish white, pale green, bluish green, amethystine; colourless in transmitted light
Solubility: Soluble in water, alters to sideronatrite in moist air
Environments
Hydrothermal environments
Fumeroles rarely
Ferrinatrite occurs as an oxidation product of iron sulphides, typically in arid regions; it occurs rarely
in fumaroles
(HOM).
Localities
At the type locality, La Compañia Mine, Sierra Gorda, Antofagasta Province, Antofagasta, Chile, ferrinatrite
is associated with metavoltine,
copiapite, coquimbite,
sideronatrite, tamarugite,
quenstedtite and römerite
(HOM).
The ferrinatrite occurs as stellate groups of crystals forming nearly spherical nodules
(Mindat).
Ferrinatrite from La Compañia Mine -
Image
At Le Cetine di Cotorniano Mine, Chiusdino, Siena Province, Tuscany, Italy, ferrinatrite is associated with
gypsum, sideronatrite,
metavoltine, tamarugite,
uklonskovite, jurbanite and
rostite
(HOM).
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