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feld·spar
[feld-spahr, fel-]
NOUN
1.
any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks.
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en.wikipedia.org/wiki/Feldspar

Feldspars are a group of rock-forming tectosilicate minerals that make up about 41% of the Earth's continental crust by weight. Feldspars crystallize from magma  ...

www.galleries.com/Feldspar_Group

The feldspar group is a fairly large group with nearly 20 members recognized, but only nine are well known and common. Those few, however, make up the ...

mineralseducationcoalition.org/minerals-database/feldspar

Feldspar is the name given to a group of minerals distinguished by the presence of alumina and silica (SiO2) in their chemistry. This group includes alumi.

geology.com/minerals/feldspar.shtml

Feldspar minerals occur in igneous, metamorphic and sedimentary rocks throughout the world. They are used to make glass, ceramics, paint, plastics, rubber ...

www.ima-na.org/?page=what_is_feldspar

Feldspar is by far the most abundant group of minerals in the earth's crust, forming about 60% of terrestrial rocks. Most deposits offer sodium feldspar as well as ...

www.pitt.edu/~cejones/GeoImages/1Minerals/1IgneousMineralz/Feldspars.html

Feldspars have two cleavage planes that intersect at 90°. Fragments of pure feldspar crystals thus tend to form rectangular blocks with irregular ends. Feldspars ...

www.mindat.org/min-1624.html

In petrology the group is split into two major groups: Alkali feldspar - feldspar minerals rich in sodium or potassium. Plagioclase - the albite to anorthite series.

www.encyclopedia.com/earth-and-environment/minerals-mining-and-metallurgy/mineralogy-and-crystallography/feldspar

Get information, facts, and pictures about feldspar at Encyclopedia.com. Make research projects and school reports about feldspar easy with credible articles ...

www.britannica.com/science/feldspar/Chemical-composition

feldspar - Chemical composition: All the rock-forming feldspars are alumino silicate minerals with the general formula AT 4 O 8 in which A = potassium, sodium, ...