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- Feldspar - Encyclopedia. com
Feldspar Feldspar is the most common mineral on Earth [1], constituting approximately 60% of the crust It forms directly from cooling magma and is a major component of granite and most other igneous rocks
- Feldspars - Encyclopedia. com
feldspars The most important group of rock-forming silicate minerals, including the alkali feldspars KAlSi 3 O 8 to NaAlSi 3 O 8 (K-feldspar to albite) and the plagioclase feldspars NaAlSi 3 O 8 to CaAl 2 Si 2 O 8 (albite to anorthite)
- Alkali Feldspar - Encyclopedia. com
alkali feldspar A group of silicate minerals that contain the alkali metal elements potassium and sodium The normal feldspar minerals (including the calcium-bearing varieties) can be plotted on a chemical basis into a triangle which has KAlSi 3 O 8 (potassium feldspar, sanidine, orthoclase (Or), or microcline), NaAlSi 3 O 8 (sodium feldspar, albite, or Ab), and CaAl 2 Si 2 O 8 (calcium
- Plagioclases - Encyclopedia. com
Plagioclase Plagioclase is a form of the mineral feldspar All feldspars are crystals of aluminum, oxygen , and silicon , plus a major additive In the case of plagioclase, the additive is calcium, sodium, or a blend of both Miscellaneous impurities may also be present
- Granite - Encyclopedia. com
Granite, which makes up 70 – 80% of Earth's crust, is an igneous rock formed of interlocking crystals of quartz, feldspar, mica, and other minerals in lesser quantities Large masses of granite are a major ingredient of mountain ranges Granite is a plutonic rock, meaning that it forms deep underground
- albitization | Encyclopedia. com
albitization The partial or complete replacement of pre-existing plagioclase feldspar or alkali feldspar by albite There are a number of ways in which this can be achieved A common process involves the residual water-rich vapour released during the final stages of crystallization of a granite body
- AFM diagram | Encyclopedia. com
Mineral and rock compositions plotting within this diagram are projected on to the Al 2 O 3 −FeO−MgO face from either the muscovite or K-feldspar point on the Al 2 O 3 −FeO edge The components of the diagram are thus A (Al 2 O 3 ), F (FeO), and M (MgO), with the projection geometry being accommodated on specially scaled axes
- Coal Washing - Encyclopedia. com
In some cases, a liquid other than water may be used to achieve this separation In a heavy medium bath, for example, a mineral such as magnetite or feldspar in finely divided form may be mixed with water, forming a liquid medium whose density is significantly greater than that of pure water
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