orthoclase feldspar


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Related to orthoclase feldspar: microcline, adularia, biotite

orthoclase feldspar:

see feldsparfeldspar
or felspar
, an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.
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References in periodicals archive ?
White ice cream cone-like sprays are sometimes seen perched on fluorite and very commonly on orthoclase feldspar.
After obtaining the key to the farm gate, we proceeded to the pocket where large (greater than 10-cm) orthoclase feldspar crystals had been excavated, together with schorl and yellow hyaline opal.