Galcite globules on Basalt

Galcite globules on Basalt

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Calcite globules. Calcite is the most stable form of calcium carbonate (CaCO3), a mineral that occurs in many forms. Limestone, chalk and marble are entirely or nearly entirely formed by calcite. The small, globular crystals here seen are a rarity, formed by radial, micro-crystalline growth in a void inside basalt, a volcanic rock. Actual width is 90 mm

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Keywords: basalt, calcite globules, calcium, calcium carbonate, chalk, crystals, earth science, geological, geology, globule, globules, lava, limestone, macro, micro-crytalline, mineral, radial, rare, rock, void, volcanic

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