Gahnite vs Benitoite
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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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Benitoite
Benitoite is a rare blue barium titanium cyclosilicate mineral that was first discovered in 1907 in San Benito County, California. It crystallizes in a rare hexagonal crystal system, typically forming distinct, triangular, sapphire-blue gemstones that exhibit strong dichroism. Designated as the official state gemstone of California in 1985, gem-quality benitoite is found almost exclusively in the...
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