name = Calaverite
category = Telluride
formula = AuTe2
molweight = 452.17 gm
color = Brass yellow to silver white
habit = Bladed and slender striated prisms, also massive granular
twinning = Common on 
cleavage = None
fracture = Uneven to subconchoidal
tenacity = Brittle
mohs = 2.5-3
luster = Metallic
opticalprop = Anisotropic
pleochroism = Weak
streak = Green to yellow grey
gravity = 9.1-9.3
diaphaneity = opaque
references = [ [http://www.mindat.org/min-852.html Calaverite: Calaverite mineral information and data ] ] [ [http://webmineral.com/data/Calaverite.shtml Calaverite Mineral Data ] ] [ [http://mineral.galleries.com/minerals/sulfides/calaveri/calaveri.htm CALAVERITE (Gold Telluride) ] ]
Calaverite, or gold telluride, is an uncommon telluride of
gold; it is a metallic mineral. It was first discovered in Calaveras County, Californiain 1861. Its chemical formula is AuTe2. Its color may range from a silvery white to a brassy yellow. It is closely related to the gold - silvertelluride sylvanite. Another mineral containing AuTe2 is krennerite. Calaverite represents a minor ore of gold and tellurium.
Calaverite occurs as
monocliniccrystals, which do not possess cleavage planes. It has a specific gravityof 9.35 and a hardness of 2.5.
Calaverite can be dissolved in concentrated
sulfuric acid. In hot sulfuric acid the mineral dissolves, leaving a spongy mass of gold in a red solution of tellurium.
Calaverite occurrences include
Cripple Creek, Colorado; Calaveras County, California, USA (from where it gets its name); Nagyag, Romania; Kirkland LakeGold District, Ontario; Rouyn District, Quebec; and Kalgoorlie, Australia.
In the Kalgoorlie
gold rushof the 1890s, large amounts of calaverite were mistaken for fool's gold, and were discarded. The mineral deposits were used as a building material, and for the filling of potholes and ruts. Several years later, the nature of the mineral was identified, leading to a minor gold rush to excavate the streets.
List of minerals
*D. M. Chizhikov, V. P. Shchastlivyi, 1966, "Tellurium and Tellurides",
Nauka Publishing, Moscow
*Klein, Cornelis and Hurlbut, Cornelius S., 1985, "Manual of Mineralogy" 20th ed., p. 289, Wiley, ISBN 0-471-80580-7
*Fortey, Richard, 2004, "The Earth", Harper Collins
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