Specific gravity: 4.5 to 4.6
Hardness: 1 to 1½
Streak: Brownish red
Kermesite is a secondary mineral that forms as an alteration of
antimony deposits (Webmin).
The oxidation often continues changing kermesite to senarmontite
Associated minerals include stibnite,
At the Damingshan Mountain, Shanglin county, Guangxi, China, exceptional kermesite crystals were found in a single pocket, associated with stibnite, valentinite, senarmontite and very rarely pääkkönenite.
At the Zhenwei (Zhenxu) antimony-gold deposit, Shanglin county, Guangxi, China, kermesite occurs in the upper oxidation zone, together with cervantite (Minrec 38.1.15-16).
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