In 1896, that tailing was discovered to be calaverite, a telluride of gold, and it sparked a second gold rush that included mining the streets.
12.
The telluride mineral calaverite was first recognized and obtained in 1861 from the Stanislaus Mine, Carson Hill, Angels Camp, in Calaveras Co ., California.
13.
Later, transmission electron microscopy study suggested that the satellite reflections in calaverite were due to Au in incommensurately displacive modulation superimposed on the average C2 / m structure.
14.
In the initial phase of the Kalgoorlie gold rush in Western Australia in 1893, large amounts of calaverite were initially mistaken for fool's gold, and were discarded.
15.
Natural gold tellurides, like calaverite and krennerite ( AuTe 2 ), petzite ( Ag 3 AuTe 2 ), and sylvanite ( AgAuTe 4 ), are minor ores of gold ( and tellurium ).
16.
Gold sometimes occurs combined with tellurium as the minerals calaverite, krennerite, nagyagite, petzite and sylvanite ( see telluride minerals ), and as the rare bismuthide maldonite ( Au 2 Bi ) and antimonide aurostibite ( AuSb 2 ).
17.
"' Calaverite "', or "'gold telluride "', is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe 2, with approximately 3 % of the gold replaced by silver.
18.
Tellurium is sometimes found in its native ( i . e ., elemental ) form, but is more often found as the tellurides of gold such as calaverite and krennerite ( two different polymorphs of AuTe 2 ), petzite, Ag 3 AuTe 2, and sylvanite, AgAuTe 4.
19.
In 2009, Bindi " et al . " concluded that the different coordination numbers associated with calaverite were indeed associated with a significant differentiation in the valence sum of Au, and that the random distribution of Ag suppresses the fluctuation of Au + and Au 3 +, whereas the ordered distribution reinforces it.
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