AbstractTimna' chrysocolla was divided into several types based on two end members differing in water content, specific gravity, CuO:SiO2ratio and apparently also in their DTA behaviour. The chrysocolla replaces quartz. In places an intergrowth of chrysocolla and wilkeite was observed by electron probe scanning. The X‐ray diffraction pattern of chrysocolla is rather poor; however diffraction patterns were obtained after controlled heating (DTA). These indicated the crystallization of tenorite, cuprite, quartz and cristobalite. Dioptase, plancheite and bisbeeite were also identified by X‐ray diffraction. Several possibilities of chrysocolla genesis are discus
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