| Terlinguaite | |
|---|---|
 Terlinguaite, collected from Mariposa Mine, Terlingua District, Brewster County, Texas, United States | |
| General | |
| Category | Halide mineral |
| Formula (repeating unit) | Hg2ClO |
| IMA symbol | Tlg |
| 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 |
| 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 | |
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. Its color is yellow, greenish yellow, brown, or olive green.
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- Handbook of Mineralogy
- Mindat.org
- Webmineral data
- Hillebrand, W. F.; Schaller, W. T. (1907). "Art. XXVI. "The Mercury Minerals from Terlingua, Texas: Kleinite, Terlinguaite, Eglestonite, Montroydite, Calomel, Mercury"". The American Journal of Science. s4-24 (139): 259–274. doi:10.2475/ajs.s4-24.141.259. Retrieved 2009-05-21.
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