'Microcline from Florissant, Colorado'

'Microcline from Florissant, Colorado'

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Credit: JOEL AREM/SCIENCE PHOTO LIBRARY

Caption: Microcline, potassium aluminum silicate, is a member of a large group of minerals known as feldspars. Feldspars are perhaps the most common and abundant minerals on earth and occur in nearly all igneous and metamorphic rocks. Microcline has a triclinic structure, versus the more common orthoclase, a potassium feldspar with a monoclinic structure. Microcline is usually colorless and forms excellent crystals, such as the ones from Florissant and other localities in Colorado. A green form of microcline, called amazonite, is a popular gem material.

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Keywords: aluminum silicate, arem collection, crystal, crystals, feldspar, geology, igneous, igneous rock, metamorphic, mineral, mineralogy, minerals, monoclinic, nature, object, ores, orthoclase, potassium aluminum silicate, potassium feldspar, rock, silicate, specimen, specimens, still life, triclinic

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