Chemical Formula: HgO
Locality: Terlingua, Texas, USA.
Name Origin: Named for Montroyd Sharp, an owner of the mercury deposit at Terlingua, Texas, USA.
History
Discovery date : 1903
Town of Origin : TERLINGUA, BREWSTER CO., TEXAS
Country of Origin : USA
Optical properties
Optical and misc. Properties: Transparent to Translucent
Refractive Index : from 2,37 to 2,65
Axial angle 2V: LARGE
Physical Properties
Cleavage: {010} Perfect
Color: Red, Brownish red, Brown.
Density: 11.2
Diaphaneity: Transparent to Translucent
Fracture: Sectile – Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Hardness: 1.5-2 – Talc-Gypsum
Luminescence: Non-fluorescent.
Luster: Adamantine
Magnetism: Nonmagnetic
Streak: reddish orange
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