Massive quartz occurring as a rock; a metamorphosed sandstone; -- called also quartz rock.
Quartz sandstone recrystallized by metamorphism. Heat and pressure fuse quartz grains together to form a dense, fine, medium, or large grained sugar textured rock.
a hard rock made entirely of quartz. Rabies: An acute viral disease that affects the nervous system of warm-blooded animals. Rabies is usually transmitted by the bite of an already rabid animal. Symptoms include drooling, and abnormal behavior, like staggering or wandering in circles. The disease is fatal if it reaches the branch.
A metamorphosed quartz sandstone formed by the deposition of secondary silica between the original grains so that the rock is more firmly cemented and less porous than the original sandstone.
A rock made almost exclusively of the mineral quartz (crystalline silicon dioxide). Commonly this happens when sediment is washed greatly, giving less chemically stable minerals the opportunity to break down and the residue washed/dissolved away. The resulting rock formed from the very clean sediment is quartzite.
is a hard metamorphic rock that is formed by compressig sandstone. The rock basically consists of quartz grains cemented together with quartz. Quartzite is a common rock. It is for instance mined in Shokhsa, Karelia. picture
A hard, light colored rock with a flinty sheen; it is a metamorphosed sandstone. See also orthoquartzite.
A compact granular rock composed of quartz crystals, usually so firmly cemented as to make the mass homogeneous. The stone is generally quarried in stratified layers, the surfaces of which are unusually smooth. It's crushing and tensile strengths are extremely high. The color range is wide.
A granulose metamorphic rock made essentially of quartz.
a rock type formed predominantly of recrystalised quartz
Light-colored to gray, massive to layered, medium-grained metamorphic rock. Very hard and resistant; a metamorphosed sandstone composed primarily of quartz.
A rock composed almost entirely of quartz.
is a metamorphic rock that results from the metamorphism (heat and pressure) of the sedimentary rock quartz sandstone.
(Geology) A hard Metamorphic Rock made up of interlocking quartz grains that have been cemented by silica.
A sandstone in which the quartz sand grains are completely cemented together by secondary quartz deposited from solution.
A granoblastic metamorphic rock consisting mainly of quartz, formed by recrystallization of sandstone by regional or thermal metamorphism (metaquartzite). Also refers to a sandstone consisting of quartz grains cemented by secondary silica (orthoquartzite).
Sandstone consisting mainly of quartz grains cemented into a hard continuous mass by silica.
hard metamorphic rock consisting essentially of interlocking quartz crystals
A very hard, unmetamorphized sandstone that consists primarily of quartz grains that have been cemented together with secondary silica so that the rock breaks across or through the grains rather than around them.
Rock. A very hard, white metamorphic rock formed from quartz sandstone (metamorphic sandstone).
A compact, fine-grained rock composed of quartz and often used in ancient times to make tools such as arrowheads, spear points, knives, and scrapers.
A metamorphic rock consisting largely or entirely of quartz. Most quartzites are formed from sandstone.
term utilized for predominantly quartz sandstone cemented with quartz.
A rock recrystallized from sandstone or chert by regional or thermal metamorphism.
It is a compact granular rock being composed of quartz crystals. It is generally firmly cemented making the mass homogeneous.
Metamorphic rock commonly formed by metamorphism of sandstone and composed of quartz. Commonly used in construction.
a compact, hard, granular rock consisting mainly of quartz.
1. A granoblastic metamorphic rock consisting mainly of quartz and formed by recrystallization of sandstone or chert by either regional or thermal metamorphism. 2. A very hard but unmetamorphosed sandstone, consisting chiefly of quartz grains that have been so completely and solidly cemented with secondary silica that the rock braks across or though the grains rather than around them. The cement grows in optical and crystallographic continuity around each quartz grain, thereby tightly interlocking the grains as the original pore spaces are filled.
Hard, somewhat glassy-looking rock made up almost entirely of quartz. Metamorphosed quartz sandstone and chert are quartzites.
A compact granular rock composed of quartz crystals, usually so firmly cemented as to make the mass homogenous. The stone is generally quarried in stratified layers, the surfaces of which are unusually smooth. Its crushing and tensile strengths are very high. Example: Quartzite Boulders
A metamorphic rock formed from exposing a sandstone to high pressures and/or temperatures.
Sandstone that has gone through the metamorphic process.
a compact granular rock composed of quartz crystals, usually so firmly cemented as to make the mass homogenous. The stones are usually quarried in stratified layers, the surfaces of which are unusually smooth. Its crushing and tensile strengths are extremely high; the color range is wide with some of the largest deposits to be found in Northern India.
Quartzite is a form of metamorphic rock, it is a compact granular quartz rock derived from sandstone. It has good abrasion resistance and is less expensive than marble or slate.
a metamorphic rock consisting largely of interlocking quartz grains; the metamorphic equivalent of a sandstone or chert.
a rock composed of quartz grains cemented with silica
A strong sandstone cemented by quartz, about 98 percent silica.
A stone which was formed in water deposited sediments and consists of sand grains which have been cemented together. It can be chipped, but is difficult to work.
1. Geologically, metamorphic rock resulting from the annealing of quartz sand stone. 2. In stone industry, a variety of sand stone composed largely of granular quartz and indurated either by metamorphism or cementation with silica to material that breaks with glassy fracture across grains and cementation alike.
a rock made entirely of the mineral quartz. Page up
(150) - Metamorphic rock composed essentially of quartz. It results from high-grade metamorphism of a quartz-rich sandstone in which recrystallization of silica has produced a tough, hard rock with interlocking quartz grains.
A compact granular rock composed of quartz and derived from sandstone by metamorphism. Quartz is the mineral SiO2 (silica dioxide) that occurs in transparent and colored crystals and crystalline masses.
sandstone composed of quartz grains firmly cemented by silica.
An extremely compact, granular rock, consisting essentially of quartz.
A metamorphic rock produced by the recrystallization of a sandstone under heat and pressure, consisting of a granular, interlocking mass of disoriented quartz crystals with irregular boundaries. moss-in-snow quartzite is the given to this material when it has specks and splashes of light and dark green molted with white (found in China).
A crystalline rock formed mainly of quartz
a granular rock composed essentially of quartz, and formed by the metamorphism of sandstone. [AHDOS
A metamorphic rock formed by the alteration of sandstone by heat, pressure and chemical activity.!-- google_ad_client = "pub-3777031107463803"; google_ad_width = 200; google_ad_height = 200; google_ad_format = "200x200_as"; google_ad_type = "text_image"; //2007-01-27: geology.com-CPP-200, geology.com-dictionary-text-2 google_ad_channel = "2639410055+9940158302"; google_color_border = "cccccc"; google_color_bg = "ddffdd"; google_color_link = "0033cc"; google_color_text = "333333"; google_color_url = "008800";
Quartzite is a hard, metamorphic rock which was originally sandstone. Through heating and pressure usually related to tectonic compression within orogenic belts, the original quartz sand grains and quartz silica cement were fused into one. Pure quartzite is usually white to grey.