It is the major metallic component in combination with sulfur and arsenic in the sulfidic cobaltite ( CoAsS ), safflorite ( CoAs 2 ), glaucodot ( ( Co, Fe ) AsS ), and skutterudite ( CoAs 3 ) minerals.
12.
"' Mohawkite "'is a rare rock consisting of mixtures of arsenic, silver, nickel, skutterudite and copper, with the formula Cu 3 As up to Cu 6 As, and the most desirable material was usually found in white quartz matrix.
