quartz rocks

См. также в других словарях:

• Quartz-porphyry — Quartz porphyry, in petrology, is the name given to a group of hemi crystalline acid rocks containing porphyritic crystals of quartz in a fine grained matrix, usually of micro crystalline or felsitic structure. In specimens, the quartz appears as …   Wikipedia

• Quartz monzonite — Igneous Rock Quartz monzonite bedrock from a UGSG drill core at Western Cape Cod, Massachusetts Quartz monzonite (or adamellite) is an intrusive igneous rock that has an approximately equal proportion of orthoclase and …   Wikipedia

• Quartz — Quartz, n. [G. quarz.] (Min.) A form of silica, or silicon dioxide ({SiO2}), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in… …   The Collaborative International Dictionary of English

• quartz´like´ — quartz «kwawrts», noun. a very hard mineral composed of silica, found in many different types of rocks, such as sandstone and quartzite, and as an important constituent in granite, gneiss, and other rocks. Crystals of pure quartz are colorless… …   Useful english dictionary

• Quartz diorite — is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with 10% or less potassium feldspar. Quartz is present at between 5 to 20% of the rock …   Wikipedia

• Quartz — This article is about the mineral. For other uses, see Quartz (disambiguation). Quartz Quartz crystal cluster from Tibet General Category …   Wikipedia

• quartz — quartzose /kwawrt sohs/, quartzous /kwawrt seuhs/, adj. /kwawrts/, n. one of the commonest minerals, silicon dioxide, SiO2, having many varieties that differ in color, luster, etc., and occurring either in masses (as agate, bloodstone, chalcedony …   Universalium

• quartz monzonite — ▪ mineral also called  adamellite        intrusive igneous rock (solidified from a liquid state) that contains plagioclase feldspar, orthoclase feldspar, and quartz. It is abundant in the large batholiths (great masses of igneous rocks mostly… …   Universalium

• quartz — Crystalline silica, SiO2, occurring either in prisms capped by rhombohedra (low temperature quartz, stable up to 573°C) or in hexagonal bipyramidal crystals (high temperature quartz, stable above 573°C). Widely distributed in rocks of all kinds;… …   Dictionary of automotive terms

• quartz — /kwɔts / (say kwawts) noun 1. one of the commonest minerals, silicon dioxide, SiO2, having many varieties which differ in colour, lustre, etc., occurring in crystals (rock crystal, amethyst, citrine, etc.) or massive (agate, bloodstone,… …  

• Bear Rocks Nature Preserve — Bear Rocks Preserve is a widely recognized symbol of West Virginia wilderness that is among the most frequently photographed places in West Virginia. It is a well known landmark on the eastern edge of the plateau that includes the Dolly Sods… …   Wikipedia