Terlinguaite
(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] 
(same H-M symbol)
c = 9.47 Å; β = 143.81°; Z = 4
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.
References
Wikimedia Commons has media related to Terlinguaite.
- ^ 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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