The Collaborative International Dictionary
Hessite
Hessite \Hess"ite\, n. [After H. Hess.] (Min.) A lead-gray sectile mineral. It is a telluride of silver.
Wiktionary
hessite
n. A mineral form of disilver telluride.
Wikipedia
Hessite
Hessite is a mineral form of disilver telluride (AgTe). 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 US in Eagle County, Colorado and in Calaveras County, California and in many other locations.
Stützite (AgTe) and empressite (AgTe) are related silver telluride minerals.