crystal tuffs

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• Tuff — (from the Italian tufo ) is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. Tuff should not be confused with tufa , another type of rock. Volcanic ashThe products of a volcanic eruption are… …   Wikipedia

• кристаллические туфы — Вулканические туфы, богатые кристаллами, в противоположность стекловатым и др. туфам [http://slovarionline.ru/anglo russkiy slovar neftegazovoy promyishlennosti/] Тематики нефтегазовая промышленность EN crystal tuffs …   Справочник технического переводчика

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

• tuff — tuff1 /tuf/, adj. Slang. tough (def. 13). tuff2 tuffaceous /tu fay sheuhs/, adj. /tuf/, n. Geol. a fragmental rock consisting of the smaller kinds of volcanic detritus, as ash or cinder, usually more or less stratified. Also called volcanic tuff …   Universalium

• Ignimbrite — is a volcanic pyroclastic rock, often of dacitic or rhyolitic composition. Ignimbrite is the deposit of a pumice rich pyroclastic density current, or pyroclastic flow , a hot suspension of particles and gases that flows rapidly from a volcano,… …   Wikipedia

• Mount Pleasant Caldera — Elevation approx. 248 m (814 ft) Listing List of volcanoes in Canada …   Wikipedia

• Richard L. Hay — Richard LeRoy Hay (April 29 1929 ndash; February 10 2006) was an American geologist whose most famous work was as the principal geologist working with Mary Leakey at Olduvai Gorge, the site of many important hominid finds in the study of human… …   Wikipedia

• Lapilli — is a size classification term for tephra, which is material that falls out of the air during a volcanic eruption. Lapilli (singular: lapillus) means little stones in Latin. They are in some senses similar to ooids or pisoids in calcareous… …   Wikipedia

• Magnesiohastingsite — from Bratislava, Slovakia. Specimen size 4.5 cm General Category Amphibole …   Wikipedia

• Hafnium — lutetium ← hafnium → tantalum Zr ↑ Hf ↓ Rf …   Wikipedia

• Spherulite — Spherulites, in petrology, are small, rounded bodies that commonly occur in vitreous igneous rocks. They are often visible in specimens of obsidian, pitchstone and rhyolite as globules about the size of millet seed or rice grain, with a duller… …   Wikipedia