Simple oxide, dimorph of valentinite
Specific gravity: 5.5
Hardness: 2 to 2½
Colour: Colourless to gray
Senarmontite is formed by oxidation of antimony,
stibnite, and other antimony minerals
in hydrothermal antimony-bearing deposits, associated with
mopungite and sulphur.
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.
At South Ham, Wolfe county, Quebec, Canada, senarmontite occurs with valentinite and kermesite as an alteration product of stibnite.
At Pernek, Slovakia, senarmontite occurs with kermesite. Dana
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