Weissite

 Weissite is a telluride mineral, a copper telluride (Cu_2−xTe). Weissite has hexagonal crystal structure. Its specific gravity is 6 and its Mohs hardness is 3. Occurrence is in Gunnison County, Colorado, Arizona and New Mexico in the United States. It is also reported from Kalgoorlie, Western Australia and Dalarna and Värmland, Sweden.^[2]

Weissite
General
Category	Telluride mineral
Formula (repeating unit)	Cu2−xTe
Strunz classification	2.BA.30
Crystal system	Hexagonal
Crystal class	Dihexagonal dipyramidal (6mmm) H-M symbol: (6/m 2/m 2/m)
Space group	P6/mmm
Unit cell	a = 12.54, c = 21.71 [Å]; Z = 15
Identification
Color	Bluish black to black with tarnish
Crystal habit	Lens shaped masses
Cleavage	None
Fracture	Uneven
Mohs scale hardness	3
Luster	Metallic
Streak	Black
Diaphaneity	Opaque
Specific gravity	6
Birefringence	Distinct
Pleochroism	Distinct
References	[1][2][3]

Weissite occurs in hydrothermal deposits associated with pyrite, native tellurium, sylvanite, petzite, rickardite, native sulfur, native gold, calaverite and krennerite.^[1]

It was first described in 1927 for an occurrence in the Good Hope Mine in the Vulcan District of Gunnison County, Colorado.^[2] It was named for mine owner Louis Weiss.

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.