A group of common aluminum silicate minerals that contains potassium, sodium, or calcium.

[alkali feldspar (K,Na)AlSi3O8] [plagioclase feldspar NaAlSi3O8 - CaAl2Si2O8] A group of rock-forming silicate minerals that are essential constituents of igneous rocks and are common in sandstones. F [..]

type of mineral common in crystalline rocks, 1785, earlier feldspath (1757), from older German Feldspath (Modern German Feldspat), from Feld "field" (see field (n.)) + spath "spar, non- [..]

Individual member of the Feldspar group.

type of mineral used in ceramics, cleaning products, and archaeological dating.

the generic name for a group of minerals made up of aluminium silicate along with calcium, potassium or sodium. A component of granite.

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

Also known as "felspar". Any of a group of aluminium silicates of potassium, sodium, or calcium. Used in the batch as a means of adding alumina to the molten glass.

Also known as "felspar". Any of a group of aluminium silicates of potassium, sodium, or calcium. Used in the batch as a means of adding alumina to the molten glass.

a group of light-coloured potassium–sodium– calcium–aluminium silicate minerals—the most common mineral type in crustal rocks

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

Group of hard crystalline minerals that consist of aluminum silicates of sodium or calcium or barium.

Family of silicate

is an essential component of nearly all crystalline rocks and constitutes a total of 60% of the earth's crust. It’s hardness ranges from 6 to 6.5 on the Moh’s scale. Feldspar

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...

see plagioclase feldspar.

A mineral group that consists of abundant, light-colored, rock-forming silicate minerals. The most common minerals are microcline, orthoclase, and plagioclase.

Any mineral that belongs to the feldspar group.

Feldspar is a very large mineral group that plays an important role in the formation of rocks. Andesine, labradorite, moonstone, and sunstone are examples of gemstones that belong to this group.

A group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize from magma in both intrusive and extrusive rocks, and they can also occur as compact minerals, as veins, and are also present in many types of metamorphic rock.

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

A group of alumino-silicate minerals (K, Na)AlSi3O8 - CaAl2Si2O8 that makes up much of the Earth’s crust

A crystalline mineral with aluminum silicates, it is used as fusion in porcelain and ceramic glazes. Source: Ralph Meyer, "A Dictionary of Art Terms and Techniques"

One of the predominant naturally occurring fluxes used primarily in stoneware glazes. The three most commonly used feldspars are Potash feldspars K20 Ah03 6Si02, Soda Feldspars Na20 Ah03 6Si02 and Lithium Feldspars Li20 Ah03 8Si02. Feldspars can be the only flux present in a stoneware glaze although this is uncommon and additions of calcium usually [..]