During the investigation of mineralization aureoles in Goldfield, Nevada, a rapid qualitative test for tellurium was desired. The method most commonly used in western mining districts is the addition of a powdered telluride to hot concentrated sulphuric acid, or vice versa. This is quite satisfactory for native tellurium, gold and silver tellurides, but the color reaction is obscured or fails when dealing with goldfieldite (Cu6Sb2(S,Te)9), tellurite, durdenite, and emmonsite. I have not had the opportunity of trying its efficacy on the copper tellurides, rickardite and weissite.

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