Pitchstone

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pitchstone [′pich‚stōn]

(geology)

A type of volcanic glass distinguished by a waxy, dull, resinous, pitchy luster. Also known as fluolite.

Pitchstone

a volcanic glass with a water content of up to 10 percent. Pitchstone is black, reddish, or light green and has a waxy, resinous luster. It contains microliths and, less frequently, phenocrysts. Distinctions are made between rhyolite, trachyte, diabase, and phonolite pitchstones. Upon heating pitchstone to high temperatures, gases are liberated with volumes 15–20 times greater than the volume of the original rock. Pitchstones are found in volcanic regions in France (Auvergne), Hungary, the German Democratic Republic (Saxony), and Great Britain (Scotland). Pitchstone is used in the production of “popped” (exploded) perlite.

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No references found			As the years - rather a lot of them - passed, the softer basalt eroded but the pitchstone stayed; hence this massive astonishing lump. Conquering the last great wilderness by guardian.co.uk / guardian.co.uk Killing In The Name Of Identity Vamik Volkan Pitchstone Publishing Charlottesville, Virginia 22901 0972887571 $29. Killing In The Name Of Identity by Buhle, Willis M. / Reviewer's Bookwatch Levine Pitchstone Publishing Charlottesville, Virginia 22901 0972887547 $24. Attack on Government by Small Press Bookwatch			pitch streak Pitch, Screw-Thread pitch-black pitch-faced pitch-row pitch-yaw-roll Pitchblende pitched roof pitched skylight pitched stone pitched-roof dormer pitcher pitcher house pitcher plant Pitcher, Molly pitchfork pitchhole pitching axis Pitching Chisel pitching fold pitching moment pitching piece pitching tool Pitchlynn, Peter pitchover Pitchstone Pitealven Piteälven Pitelino Piter Jelles Troelstra Pitesti pitfall Pith pith fleck pith knot pith ray Pithecanthropus Pithecanthropus erectus Pithecia Pithom Pithon Pithos Pitirim Alexandrovitch Sorokin Pitiusas Islands Pitkiaranta Pitkin County pitman pitman arm Pitman, Sir Isaac Pitney, Mahlon Pitoeff			Pitching piece Pitching piece Pitching Runs Above Replacement pitching tool pitching tool pitching up pitching up pitching up pitching up pitching up pitching wedge pitching wedge Pitching woo Pitching woo Pitching woo Pitchlynn, Peter pitchman pitchman pitchmen pitchometer pitchout pitchouts pitchover Pitchpipe Pitchpipe pitchpole pitchpoled pitchpoles pitchpoling Pitchshifter Pitchstone Pitchware Pitchwork pitchy PITCL PITCO Pitcoal Pitcoal Pitcure Pitcure Pitcure Pitcure PITD Pite Pite River Pite-=*scedil.gif=-ti Piteå Dansar Och Ler Pitealven Piteälven PITEC Piteira-azul Piteira-azul Piteira-azul Pitelino piteous piteous piteously piteously piteousness piteousness Piter

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Pitchstone