feldspar

Noun

Meaning

Alt. of Feldspath

Source: Webster's dictionary

felspar garnet emery graphite clay crystal mica SPAR brimstone mineral gypsum calcite alabaster bauxite fluorite

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SPAR mineral

Albite is considered both a plagioclase and alkali feldspar. Source: Internet

Composition of syenites The feldspar component of syenite is predominantly alkaline in character (usually orthoclase ). Source: Internet

By definition, granite is an igneous rock with at least 20% quartz and up to 65% alkali feldspar by volume. Source: Internet

Gneisses also, as a rule, contain more feldspar than schists do, and are tougher and less fissile. Source: Internet

Below is a description of the different types of feldspar. Source: Internet

Colours will usually be tan or yellow (from a blend of the clear quartz with the dark amber feldspar content of the sand). Source: Internet