common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium-sodium) feldspars. Feldspars make up about 60%...
25 KB (2,434 words) - 22:46, 14 June 2024
Feldspar is a group of rock-forming minerals, including: Alkali feldspar Alkali feldspar granite Potassium feldspar Feldspar may also refer to: A community...
381 bytes (80 words) - 04:33, 11 August 2024
Potassium feldspar refers to a number of minerals in the feldspar group, and containing potassium: Orthoclase (endmember formula KAlSi3O8), an important...
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Plagioclase (redirect from Plagioclase feldspar)
is a series of tectosilicate (framework silicate) minerals within the feldspar group. Rather than referring to a particular mineral with a specific chemical...
25 KB (2,886 words) - 02:59, 25 August 2024
(phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and...
57 KB (6,589 words) - 13:07, 12 September 2024
Alkali feldspar granite, some varieties of which are called 'red granite', is a felsic igneous rock and a type of granite rich in the mineral potassium...
4 KB (353 words) - 05:36, 25 August 2024
Orthoclase (redirect from Orthoclase Feldspar)
Orthoclase, or orthoclase feldspar (endmember formula KAlSi3O8), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient...
8 KB (598 words) - 04:23, 14 September 2024
type Andesite – Type of volcanic rock Alkali feldspar granite – Type of igneous rock rich in alkali feldspar Anorthosite – Mafic intrusive igneous rock...
14 KB (2,187 words) - 23:33, 16 April 2024
Moonstone (gemstone) (category Feldspar)
Moonstone is a sodium potassium aluminium silicate ((Na,K)AlSi3O8) of the feldspar group that displays a pearly and opalescent schiller. An alternative name...
5 KB (393 words) - 02:39, 5 July 2024
Oligoclase (redirect from Lime-soda feldspar)
Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. In chemical composition and in its crystallographic and physical characters...
5 KB (496 words) - 13:17, 11 May 2024