Olivenite vs Gahnite
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Olivenite
Olivenite is a copper arsenate hydroxide mineral with the chemical formula Cu2AsO4OH. It commonly occurs in olive-green shades and forms in the oxidized zones of copper- and arsenic-bearing ore deposits, where it may appear as crystals or earthy aggregates. Mineral collectors value it for its color and crystal habits, while its composition makes it relevant to the study of secondary copper mineral...
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Gahnite
Gahnite is the zinc-rich spinel-group mineral with the ideal formula ZnAl2O4. It was described from the Falun mine in Sweden in 1807, and its name honors Swedish chemist and mineralogist Johan Gottlieb Gahn. It commonly forms dark green, bluish green, blue, or nearly black crystals and granular masses in granite pegmatites, metamorphic rocks, and metamorphosed sulfide deposits; specimens are chief...
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