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Formula: Zn3Te6+O6
Tellurate
Crystal System: Monoclinic
Specific gravity: 6.0 calculated
Hardness: Less than 2
Streak: White
Colour: Green, light greenish grey
Solubility: At room temperature, slowly soluble in dilute hydrochloric acid and rapidly soluble in concentrated
hydrochloric acid
Environments
Dagenaisite is a relatively new mineral, approved in 2017.
Localities
The type locality, the Gold Chain Mine, Mammoth, Tintic Mining District, Juab County, Utah, USA, exploited a
polymetallic gold - silver -
copper - lead -
zinc vein deposit emplaced in
dolostone. The upper portion of the deposit is almost completely
oxidised.
Dagenaisite was collected underground; it is associated with
cinnabar, dugganite,
eurekadumpite and gold in vugs
in a matrix composed of quartz and
dolomite. Altered remnants, probably of
hessite, are embedded in the matrix. Other minerals identified in the
general assemblage include adamite,
arseniosiderite,
atelestite, baryte,
beudantite, conichalcite,
hemimorphite, kettnerite,
malachite, mimetite,
mixite, olivenite and
rosasite.
Dagenaisite is clearly a late stage secondary phase
formed by the oxidative alteration of earlier tellurium- and
zinc- bearing minerals, probably
hessite and sphalerite
(CM 55.867-873).
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