Random Image for perthite
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Possible definitions for perthite
perlite
Natural glass with concentric cracks such that the rock breaks into small, pearl-like bodies. It is formed by the rapid cooling of viscous lava or magma. Perlite is porous and has a waxy to pearly luster and is commonly gray or greenish but may be brown, blue, or red. Since c.1950, large deposits have been worked in New Mexico, Nevada, California, and other W states. Heat-treated perlite is a substitute for sand in lightweight wall plaster and concrete aggregate. Perlite is used for heat and sound insulation, lightweight ceramic products, and filters.
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