Terlinguaite

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Terlinguaite
Terlinguaite, collected from Mariposa Mine, Terlingua District, Brewster County, Texas, United States
Halide mineral
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Tlg
3.DD.20
Monoclinic
Prismatic (2/m) (same H-M symbol)
C2/c
a = 19.51 Å, b = 5.91 Å c = 9.47 Å; β = 143.81°; Z = 4
Sulfur-yellow, greenish yellow, brown
Aggregates of equant to elongated crystals, powdery, massive
Perfect on [101]
Brittle
2.5
Brilliant adamantine
Lemon-yellow, turning olive-green
Transparent to translucent
9.22
Biaxial (-)
nα = 2.350 nβ = 2.640 nγ = 2.660
δ = 0.310
Weak, green and yellow
Measured: 20°
turns olive-green on exposure to light

Terlinguaite is the naturally occurring mineral with formula Hg4+3Hg2+Cl2O2. It is formed by the weathering of other mercury-containing minerals. It was discovered in 1900 in the Terlingua District of Brewster County, Texas, for which it is named. Its color is yellow, greenish yellow, brown, or olive green.

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