Search results
Granite. Granite ( / ˈɡrænɪt / GRAN-it) is a coarse-grained ( phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground.
Apr 4, 2024 · feldspar, any of a group of aluminosilicate minerals that contain calcium, sodium, or potassium. Feldspars make up more than half of Earth’s crust, and professional literature about them constitutes a large percentage of the literature of mineralogy. Of the more than 3,000 known mineral species, less than 0.1 percent make up the bulk of Earth ...
Orthoclase (endmember formula K Al Si 3 O 8) is an important tectosilicate mineral which furms igneous rock. The name is frae the Greek for "straight fracture," acause its twa cleavage planes are at richt angles tae ilk ither. Alternate names are alkali feldspar, potassium feldspar an K-feldspar.
Alkali feldspar granite, some varieties of which are called 'red granite', [1] is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar (K-spar). It is a dense rock with a phaneritic texture. The abundance of K-spar gives the rock a predominant pink to reddish hue; peppered with minor amounts of black minerals.
Felspar ( K Al Si 3 O 8 – Na Al Si 3 O 8 – Ca Al 2 Si 2 O 8) adalah kelompok mineral tektosilikat pembentuk batuan yang membentuk 41% kerak Bumi. [1] Felspar mengkristal dari magma pada batuan beku intrusif dan ekstrusif dalam bentuk urat, dan juga terdapat dalam berbagai jenis batuan metamorf. [2] Batuan yang hampir seluruhnya terbentuk ...
Feldspar in granite. Feldspar is the name of a group of rock-forming tectosilicate minerals that make up as much as 60% of the Earth 's crust . Feldspar forms crystals from magma in both intrusive and extrusive rocks, and they can also happen as compact minerals, as veins, and are also present in many types of metamorphic rock. Rock formed ...
Moonstone (gemstone) Not to be confused with Moon rock. For other uses, see Moonstone (disambiguation). Moonstone is a sodium potassium aluminium silicate ( (Na,K)AlSi 3 O 8) of the feldspar group that displays a pearly and opalescent schiller. [1] [2] An alternative name for moonstone is hecatolite [2] (from goddess Hecate ).
