Loading AI tools
From Wikipedia, the free encyclopedia
Terlinguaite is the naturally occurring mineral with formula Hg2ClO. 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.[5] Its color is yellow, greenish yellow, brown, or olive green.
Terlinguaite | |
---|---|
![]() Terlinguaite, collected from Mariposa Mine, Terlingua District, Brewster County, Texas, United States | |
General | |
Category | Halide mineral |
Formula (repeating unit) | Hg2ClO |
IMA symbol | Tlg[1] |
Strunz classification | 3.DD.20 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/c |
Unit cell | a = 19.51 Å, b = 5.91 Å c = 9.47 Å; β = 143.81°; Z = 4 |
Identification | |
Color | Sulfur-yellow, greenish yellow, brown |
Crystal habit | Aggregates of equant to elongated crystals, powdery, massive |
Cleavage | Perfect on [101] |
Tenacity | Brittle |
Mohs scale hardness | 2.5 |
Luster | Brilliant adamantine |
Streak | Lemon-yellow, turning olive-green |
Diaphaneity | Transparent to translucent |
Specific gravity | 9.22 |
Optical properties | Biaxial (-) |
Refractive index | nα = 2.350 nβ = 2.640 nγ = 2.660 |
Birefringence | δ = 0.310 |
Pleochroism | Weak, green and yellow |
2V angle | Measured: 20° |
Alters to | turns olive-green on exposure to light |
References | [2][3][4] |