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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 ...
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
The most common moonstone is of the orthoclase feldspar mineral adularia, named for an early mining site near Mt. Adular in Switzerland, now the town of St. Gotthard. [1] [better source needed] A solid solution of the plagioclase feldspar oligoclase +/− the potassium feldspar orthoclase also produces moonstone specimens.
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. ...
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.
Feldspar is a group of rock-forming minerals, including: Alkali feldspar; Alkali feldspar granite; Potassium feldspar; Feldspar may also refer to: A community in Tay Valley, Ontario, Canada; USS Feldspar (IX-159), a concrete barge; Craig Feldspar, a character in the American television comedy series Malcolm in the Middle
Celsian is a barium feldspar with a chemical composition BaAl 2 Si 2 O 8. It forms part of the feldspar group and belongs to the celsian-hyalophane series and the celsian-orthoclase series. It has some resemblance to anorthite, and it has four distinct polymorphs. The essential elements are silicon, aluminum, oxygen, and barium.
Specimens of potassium feldspar that display a phenomenon remarkably similar to Rainbow lattice sunstone have been found in the area of Statesville, North Carolina. [4] This material contains brown and black exsolution platelets of hematite and ilmenite that show thin-film interference colors along the interface with the host feldspar.