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Formula: Hg2OCl
Hg1+Hg2+OCl
Oxyhalide
Crystal System: Monoclinic
Specific gravity: 8.725 measured, 8.73 calculated
Hardness: 2 to 3
Streak: Lemon yellow
Colour: Yellow, yellow-green, brown, darkens to olive-green on exposure to light, pale olive-green in transmitted light
Environments
Terlinguaite is a rare secondary mineral in hydrothermal
mercury deposits. Associated minerals include
cinnabar, metacinnabar,
eglestonite, kleinite,
montroydite, calomel and
mercury
(HOM).
Localities
At the Clear Creek claim, Goat Mountain, New Idria Mining District, San Benito county, California, USA,
terlinguaite is very rare, but has been found associated with
eglestonite and montroydite
(Minrec 36.4.350).
At the type locality, the Terlingua Mining District, Texas, USA, terlinguaite is associated with
calomel, eglestonite,
kleinite, montroydite,
mercury and cinnabar
(Dana).
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