Terlinguaite

terlinguaite

eglestonite

montroydite

cinnabar

Images

Formula: Hg2OCl
Hg1+Hg2+OCl
Oxyhalide
Specific gravity: 8.725
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

Hydrothermal 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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