pearlstone

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perlite

or pearlstone

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 lustre 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 western 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.

pearlstone [′pərl‚stōn]

(geology)

perlite

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No references found			The five-year-old was second to Pearlstone last time out over two miles at Southwell and was travelling well until making a mistake at the last. RACING: Nicky's star is set to strike Gold by Coventry Evening Telegraph (England) And, in 1980, Pearlstone and Tommy Finn overcame Rent-A-Row and Noble Star to give Mullins a third Galway Hurdle win in just five years. Racing: Galway Festival: Keeping up with the MULLINS' is far from ... by The Mirror (London, England) The five-year-old was second to Pearlstone last time out over two miles at Southwell and was travelling well until making a mistake at the last. RACING: Isio is ready to take step up by Coventry Evening Telegraph (England)			Pearl Buck Pearl Essence Pearl Harbor Pearl Harbor attack Pearl Harbor Day Pearl Harbor National Wildlife Refuge pearl hardening Pearl Hill State Park Pearl Lake State Park pearl lamp pearl molding pearl moss Pearl Oysters Pearl River Pearl River County pearl sinter pearl spar pearl white Pearl, Raymond Pearl, The Pearl-Reed curve Pearlite Pearls pearls before swine Pearlstein, Philip pearlstone pearly pearly tumor Pearrygin Lake State Park Pears Pears, Sir Peter Pearse Pearse, Patrick Henry Pearson Pearson Curves Pearson Metropark Pearson Type I distribution Pearson, Drew Pearson, John Pearson, Karl Pearson, Lester B Pearson, Lester Bowles Pearson, Sir Cyril Arthur Pearson, Thomas Gilbert Peary Peary Land Peary, Harold Peary, Robert E Peary, Robert E. Peary, Robert Edwin peasant			pearliest pearliest pearliness pearliness pearliness pearling pearling pearling pearling Pearlins pearlised pearlite pearlite Pearlitic Pearlitic pearlized pearls pearls pearls pearls pearls Pearls Before Swine Pearls Before Swine Pearls Before Swine Pearls Before Swine (disambiguation) Pearls Before Swine (game) Pearls Before Swine (game) Pearls of Wisdom pearls, Epstein's Pearlstein, Philip pearlstone Pearlware Pearlware pearlweed pearlwort pearlworts pearly pearly pearly pearly pearly everlasting pearly everlastings Pearly Gates Pearly King Pearly Kings Pearly Kings and Queens pearly nautili pearly nautilus pearly nautiluses pearly penile papule Pearly penile papules Pearly penile papules Pearly Queen Pearly Queens pearly razorfish pearly tubercle pearly tumor pearly tumor Pearly whites Pearly whites Pearly whites

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