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Feldspar (/ ˈ f ɛ l (d) ˌ s p ɑːr / FEL(D)-spar; sometimes spelled felspar) is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. [3] The most common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium ...
Unakite is a metamorphic rock that is altered granite composed of pink orthoclase feldspar, green epidote, and generally colorless quartz. Discovery
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. [2] [3]
Orthoclase, or orthoclase feldspar (endmember formula K Al Si 3 O 8), is an important tectosilicate mineral which forms igneous rock. The name is from the Ancient Greek for "straight fracture", because its two cleavage planes are at right angles to each other. It is a type of alkali feldspar, also known as potassium
Microcline (KAlSi 3 O 8) is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase.
Exposures are typically gray to pink, medium-to-coarse grained, monzogranite. Aplite and pegmatite dikes crosscut by quartz veins are common. The average modal composition is 28% quartz, 25% potassium feldspar, 38% plagioclase, 8% biotite, and 1% accessory minerals, including magnetite, titanite, zircon, hornblende, apatite, and muscovite. [1]
The pink crystals are potash feldspar. The Mugga Mugga Porphyry is a lava flow. It is blue or mauve grey in a mass. The rock is veined with calcite, light green epidote, and deep red hematite. The phenocrysts are quartz, grey plagioclase, pink potash feldspar in lesser amounts and flakes of biotite. It is dated at 414±9 Mya.
This is a category for feldspar minerals, feldspar production, uses of feldspar, etc. Subcategories. This category has the following 2 subcategories, out of 2 total. ...