No images
Formula: Ag2TeS3
Valence: Ag1+2Te4+S2-3
Sulphosalt containing tellurium and
silver
Crystal system: Monoclinic
Specific gravity: 5.33 calculated
Hardness: 2½
Colour: Dark red
Environments
Metamorphic environments
Hydrothermal environments
Zavyalovite is a very rare case of a primary non-oxygen
mineral where Te is a Te4+ cation surrounded by S atoms
(Mindat)
Localities
At the type locality, the Boevskoe Be deposit, Kaslinsky District, Chelyabinsk Oblast, Russia, zavyalovite
occurs as very small anhedral grains (typically 5-15 μm, max. up to 30 μm across) or narrow veinlets within
galena or at the contact of galena
and sphalerite. Zavyalovite is dark red, opaque with sub-metallic
lustre, brittle tenacity and uneven fracture. Internal reflections are abundant, red in colour
(Mineralogical Magazine, 1-17 doi:10.1180/mgm.2025.10142).
Associated minerals include galena,
sphalerite, quartz,
anglesite, native bismuth,
bismutite, chalcopyrite,
eskimoite, hessite,
joséite-B, matildite,
perite, pyrite,
tellurite, zavaritskite and
boevskite
(Mindat).
Back to Minerals