Hessite is a

mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2 ...

form of disilver telluride (Ag₂Te). It is a soft, dark grey

telluride mineral A telluride mineral is a mineral that has the telluride anion as a main component. Tellurides are similar to sulfides and are grouped with them in both the Dana and Strunz mineral classification systems.http://webmineral.com/strunz/II.shtml Webm ...

which forms

monoclinic In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic s ...

crystals. It is named after

Germain Henri Hess Germain Henri Hess (russian: Герман Иванович Гесс, German Ivanovich Gess; 7 August 1802 – 30 November 1850) was a Swiss-Russian chemist and doctor who formulated Hess's law, an early principle of thermochemistry. Early li ...

(1802–1850). Hessite is found in the US in

Eagle County, Colorado Eagle County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 55,731. The county seat is the Town of Eagle and the most populous community is Edwards. The county is named for the Eagle River. Eagl ...

and in

Calaveras County, California Calaveras County (), officially the County of Calaveras, is a county in both the Gold Country and High Sierra regions of the U.S. state of California. As of the 2010 census, the population was 45,292. The county seat is San Andreas. Angels C ...

and in many other locations.

Stützite Stützite or stuetzite is a silver telluride mineral with formula: Ag5−xTe3 (with x = 0.24 to 0.36) or Ag7Te4. It was first described in 1951 from a museum specimen from Sacarimb, Romania. It was named for Austrian mineralogist Xavier Stütz ...

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

References

Silver minerals Telluride minerals Monoclinic minerals Minerals in space group 14 Minerals described in 1843 {{Mineral-stub