Celestite vs Gahnite
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Celestite
Celestite is a mineral composed of strontium sulfate and is named for its pale sky-blue color, although it can also occur in white or other shades. It forms crystals and geodes that are collected as mineral specimens and, when transparent and attractive, may be cut or displayed as a gemstone. Important deposits occur in Madagascar and Ohio, and celestite is the principal commercial source of stron...
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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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