A general name for a group of important rock-forming minerals which are potassium-aluminum silicates and plagioclase, a subgroup composed of sodium-aluminum silicate or calcium-aluminum silicates or mixtures of these. Includes orthoclase and microcline.

mineral group of silicate minerals commonly containing calcium, sodium, potassium and aluminium.

Any of a group of abundant rock-forming minerals occurring principally in igneous, plutonic, and some metamorphic rocks, and consisting of silicates of aluminium with potassium, sodium, calcium and rarely barium. About 60 percent of the earth's outer crust is composed of feldspar.

A crystalline mineral consisting of aluminum silicates and other elements that is an essential ingredient for the ceramics industry, and also is used in the glass and paint industries. A group of rock-forming minerals. Includes: microcline, orthoclase, plagioclase and anorthoclase.

A group of abundant rock forming minerals of the general formula: MAl(Si,Al) 3O8, where M may represent K, Na, or Ca. Feldspars are the most widespread of any mineral group and constitute 60% of the Earth's crust. They occur as components of almost all kinds of rocks.

Any mineral belonging to the feldspar group.

(feld'-spar) The monoclinic or triclinic minerals with the general formulae KAlSi3O8 - K,NaAlSi3 O8 and NaAlSi3 O8 - CaAl2Si2O8. The feldspar mineral group contains two high-temperature series, the plagioclase series (albite, oligoclase, andesine, labradorite, bytownite, and anorthite) and the alkali feldspar series (sanidine, anorthoclase, orthoclase, and microcline). Barium feldspars such as celsian and hyalophane are realatively rare. The feldspar minerals are colorless, white, pink, salmon-pink, light or dark gray and clear to translucent and commonly twinned by one or more twin laws. Feldspar group minerals have two directions of cleavage that intersect at or near 90o and a Mohs hardness of 6. Feldspars group minerals compose 60% of the Earth's crust. Feldspar occurs in all rock types and alters at atmospheric conditions to form clay minerals.

A mineral found in many different rocks. It is one of the many materials used to make glass.

(feld' spar) - A major rock building mineral containing silicates of aluminum.

Transparent or whitish, often greyish mineral, may also be pink, green or black, composed of potassium, sodium or calcium combined with aluminium, silicon and oxygen. It is used chiefly in the ceramics industry.

This name comes from the German word for "field" and "clip of wood." Feldspars are the most common of all minerals. Certain kinds are used in glass making, while others are set in jewelry.

Feldspars are aluminum-rich silicate minerals that are very common in rocks like granite. Most feldspars are white or pink, and form rectangular crystals with excellent cleavage (or preferred breaking surfaces). The name of one of the most common feldspars, orthoclase, means "straight-breaking" in reference to this cleavage. As a group, feldspars are the most common minerals in the Earth's crust.

The general term for a group of important aluminosilicate (rich in Al and Si) minerals. Includes plagioclase feldspar, which contains Na and/or Ca; and alkali feldspar, which contains K. Feldspars are the most common minerals in the Earths' crust.

Group of minerals that are aluminum silicates containing potassium, sodium, and/or calcium. Some minerals in this group are wrongly classified as other minerals in this group. This is the most abundant group of minerals on the earth, and the building block of many rocks. The feldspar group is in the tectosilicates subdivision of the silicates group.

A group of common rock- forming minerals that includes microcline, orthoclase, plagioclase and others.

A basic ingredient in many clay bodies as well as glazes. A group of silicate minerals formed from igneous rock material, and an important constituent of china stone. The combination of alkali (potassium or sodium), alumina and silica makes feldspars valuable fluxes for both porcelain and stoneware. Melts at 1250ºC to form a simple glaze.

any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium

A group of minerals that are made up of Silicon, Oxygen plus various metals such as Aluminium, Calcium and Potassium.

The general name given to any of a group of common rock-forming aluminum silicate minerals that contain the elements potassium, sodium, calcium, or some combination of these. There are two major divisions: plagioclase feldspars and potassium feldspars.

Any of a group of crystalline minerals, all silicates of aluminum with either potassium, sodium, calcium, or barium. An essential constituent of nearly all crystalline rocks.

A common mineral occurring in igneous rocks that sometimes erodes out and becomes incorporated into sedimentary rocks. Feldspar is the most common mineral in the world.

A family of minerals consisting primarily of alkali feldspar and plagioclase. The most common mineral group in the earth's crust. See also the field guide entry for feldspar.

A mineral aggregate used as a flux or glass forming agent in ceramic bodies and glazes.

A group of abundant rock-forming minerals of the general formula, MAl(Al,Si)3O8. Feldspar are the most widespread of any mineral group and constitute 60% of the earth's crust; they occur in all types of rock. Feldspar are white and grey to pink and have a hardness of 6

Group of crystalline minerals used as fluxes in bodies and glazes. A main ingredient in the production of porcelain.

Family of silicate minerals containing varying amounts of potassium, sodium and calcium along with aluminum, silicon and oxygen. Potassium feldspars contain considerable potassium. Plagioclase feldspars contain considerable sodium and calcium. Feldspar crystals are stubby prisms, generally white, gray, or pink. more details...

Feldspar - Silicates of potassium, sodium, or calcium that are the primary constituents of many igneous rocks.

One of the predominant naturally occurring fluxes used primarily in stoneware glazes. Feldspars can be the only flux present in a stoneware glaze although this is uncommon and additions of calcium usually supplement it.

a common mineral composed of silica (Si), aluminum (Al), and calcium (Ca), potassium (K), or sodium (Na): CaAl2Si2O8,KAlSi3O8,NaAlSi3O8

A common group of rock-forming minerals composed of silicates of aluminum and one or more of potassium, sodium or calcium.

The most common group of rock-forming minerals. They contain sili-con, oxygen, aluminum, and some combination of the metals sodium, potassium, and calcium. They are hard, opaque, and break along flat, reflective surfaces, which meet at right angles. Orthoclase feldspar usually is white, beige, or pink in color, whereas plagioclase feldspar usually is white or gray in color.

A constituent of granite, basalt, and other igneous rocks that form a large part of the earth's crust. Clay is the chief substance formed when weathering decomposes feldspars. (See also Bedrock)

A white or colourless mineral that is found in many types of volcanic rock.

One of the most important glaze materials. It is used in almost all glazes, and in high-fired glazes it is often the principal material and provides the principal flux. Feldspar is made up of (a) an alkaline portion consisting of sodium, potassium, or calcium, singly or in combination; (b) alumina; and (c) silica.

A group of rock-forming minerals with the general formula MAl(Al,Si)3O8, where M can be the metals K, Na, Ca, Ba, Rb, Sr, or Fe. Feldspars are the most widespread mineral group, occurring in all types of rock and comprising about 60% of the Earth's crust.

an abundant group of rock-forming, hard crystalline minerals containing potassium, sodium, calcium, silicates of aluminum and sometimes barium. It is used widely to produce stoneware, porcelain and glazes as a flux.

the name of a group of minerals that makes up almost 60% of Earth's crust

A common silicate mineral that occurs in all rock types and decomposes to form much of the clay in soil, including kaolinite.

any of a group of abundant rock-forming minerals occuring in igneous, sedimentary, and metamorphic rocks and consisting of silicates of aluminum with potassium, sodium, and calcium - BACK

Feldspars are a family of minerals that include moonstone (adularia), amazonite, sunstone, and labradorite.

A group of abundant rock-forming minerals of the general formula, MAl (Al,Si)3O8 where M can be K, Na, Ca, Ba, Rb, Sr, and Fe. Most widespread of any mineral group, feldspar may constitute 60% of the earth's crust, occurring in all types of rock. When the positive ion is K+, the mineral is orthoclase; when it is Na+, it is albite; when it is Ca+2, it is anosthite.

A large group of minerals that is found in a wide area of the earth, but only a few of its members, including moonstone, is suitable for gemstones.

group of silicate or aluminum minerals, with a three-dimensional crystalline structure (tectosilicates). The main subgroups are the plagioclases (calcium-rich term is anorthite, sodium-rich term is albite, intermediate terms are labrador and oligoclase) and the orthoclases (potassium feldspars)

A silicate mineral group, most important group of rock forming minerals being essential constituents of igneous rocks, present in most metamorphic rocks and in many sedimentary rocks;

Complex of silicates that make up bulk of the earth’s crust.

(Also called felspar). A crystalline substance found in granite.

Mineral found in granite which melts around 2300 Fahrenheit, used as a flux in clay bodies and glazes. When feldspar rock loses its alkaline content through decomposition it becomes kaolin and is thus the origin of clay.

A family of minerals which are all silicates of alumina with either potash, soda, or lime. They're usually white or nearly white, flesh-red, bluish, or greenish, and occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other. The feldspars are essential constituents of nearly all crystalline rocks, such as Granite, gneiss, mica, slate, most kinds of basalt and trachyte, etc.

any of a group of common rock-forming minerals composed of silicate of aluminum, combined with sodium and either potassium or calcium. [AHDOS

Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust.