HESSITE and SPHALERITE Botes, Alba Co, Romania, Europe Size: 5.5 x 3 x 2 cm (Small Cabinet) Owner: Crystal Classics

Chemical Formula: Ag2Te
Locality: Calaveras, Nevada
Name Origin: Named after the Swiss chemist, G. H. Hesse (1802-1850).

Hessite is a mineral form of disilver telluride Ag2Te). It is a soft, dark grey telluride mineral which forms monoclinic crystals.

It is named after Germain Henri Hess (1802–1850).

Hessite is found in the USA in Eagle County, Colorado and in Calaveras County, California and in many other locations.

Stützite (Ag7Te4) and empressite (AgTe) are related silver telluride minerals.

Physical Properties

Cleavage: {100} Indistinct
Color: Lead gray, Steel gray.
Density: 7.2 – 7.9, Average = 7.55
Diaphaneity: Opaque
Fracture: Uneven – Flat surfaces (not cleavage) fractured in an uneven pattern.
Hardness: 1.5-2 – Talc-Gypsum
Luminescence: Non-fluorescent.
Luster: Metallic
Magnetism: Nonmagnetic
Streak: light gray

Photos :

Gold with Coloradoite, Hessite and Sylvanite in Quartz Locality: Bessie G Mine, La Plata District (California District), La Plata County, Colorado Specimen Size: 12.1 x 9.3 x 5.3 cm (cabinet) © minclassics
Botés, Alba Co., Romania © Van King