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Formula: AgAsS2
Sulpharsenite, monoclinic paramorph of trigonal
trechmannite
Crystal System: Monoclinic
Specific gravity: 4.88
Hardness: 1½ to 2
Streak: Vermilion red
Colour: Pale red, red-orange or brownish orange on exposure to light
Common impurities: Sb
Environments
Localities
At Jas Roux, La Chapelle-en-Valgaudemar, Gap, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France, smithite is associated
with chabournéite, pierrotite,
parapierrotite, stibnite,
pyrite, sphalerite,
twinnite, zinkenite,
madocite, andorite,
laffittite, routhierite,
aktashite, wakabayashilite,
realgar and orpiment
(HOM).
At the Mogul mine, Silvermines District, Tipperary County, Munster, Ireland, smithite is associated
with proustite, gersdorffite and
miargyrite
(HOM).
At the type locality, Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland, smithite is associated
with sphalerite, pyrite,
realgar, orpiment,
hutchinsonite, sartorite and
rathite
(HOM).
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