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Formula: Sb2O3
Simple oxide, antimony-bearing mineral,
paramorph of
valentinite
Crystal System: Isometric
Specific gravity: 5.5 measured, 5.584 calculated
Hardness: 2 to 2½
Streak: White
Colour: Colourless to gray
Environments:
Senarmontite is formed by oxidation of antimony,
stibnite, and other antimony minerals
in hydrothermal antimony-bearing deposits, associated with
valentinite, kermesite,
stibiconite, cetineite,
mopungite and sulphur
(HOM).
Localities
At the type locality, the Djebel Hammimat Mine, Constantine Province, Algeria, senarmontite occurs with
kermesite, valentinite and
other minerals as an alteration product of stibnite, in veins in a bituminous
marly sediment
(Dana).
At South Ham, Wolfe county, Quebec, Canada, senarmontite occurs with
valentinite and kermesite as
an alteration product of stibnite
(Dana).
At Pernek, Slovakia, senarmontite occurs with kermesite
(Dana).
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