The alkali feldspar group are those feldspar minerals rich in the alkali elements, potassium and sodium. The alkali feldspars include albite, anorthoclase, microcline, orthoclase and sanidine. Albite is considered as one of the alkali feldspars according to its chemical composition and it is also the alkali endmember of the plagioclase series. Pot...
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http://en.wikipedia.org/wiki/Alkali_feldspar
any of several common silicate minerals that often occur as variously coloured, glassy crystals. They are used in the manufacture of glass and ... [4 related articles]
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http://www.britannica.com/eb/a-z/a/46
sack term applied in some schemes of petrographic nomenclature, especially those for igneous rocks, to potassium feldspar (microcline or orthoclase), sodium-rich plagioclase (albite) and/or their perthitic combinations. In the vernacular, it is frequently used as a synonym for potassium feldspar.
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https://www.encyclo.co.uk/local/20132
A general term for feldspar of the K-Na solid solution, orthoclase/sandine - orthoclase.
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https://www.encyclo.co.uk/local/20501
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