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uk.ask.com/what-is/what_is_a_moonstone
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Moonstones come in two varieties: orthoclase feldspar (which contains potassium) and plagioclase feldspar (which contains calcium or sodium).
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answers.askkids.com/Fun_Science/what_is_feldspar
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A feldspar is a group of minerals. They are usually aluminosilicates of potassium, sodium, and calcium. One of it's characteristics is it has two cleavages at nearly right angles.
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avalonraremetals.com/rare_earth_metal/specialty_mineral...
avalonraremetals.com/rare_earth_metal/specialty_minerals/calcium_feldspar/
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Calcium rich feldspars are termed ´anorthites´. Where calcium feldspar is the predominant rock-forming mineral, the rock is termed ´anorthosite´. Deposits of ...
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www.galleries.com/Feldspar_Group
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The general formula, for the common feldspars, is XAl(1-2) Si(3-2) O8 . The X in the formula can be sodium, Na and/or potassium, K and/or calcium, Ca.
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www.mindat.org/min-39163.html
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Calcium Feldspar mineral data, information about Calcium Feldspar, its properties and worldwide locations.
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digitalfire.com/4sight/material/calcium_feldspar_175.ht...
digitalfire.com/4sight/material/calcium_feldspar_175.html
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Feldspars are roughly divided into lithium, potash, soda, and calcium according the to fluxing oxide that predominates (theoretical formulae for each type are not ...
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www.mineralszone.com/minerals/feldspar.html
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Sodium feldspar is albite (Na2O, Al2O3, 6SiO2) and calcium feldspar is anorthite (CaO, Al2O3, 2SiO2). A variety of crossed, hatched, twinned orthoclase (to be ...
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www.tapanmicrons.com/feldspar.htm
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The common feldspar is potassium feldspar, namely, orthoclase (K2O, Al2O3, 6SiO2). Sodium feldspar is albite (Na2O, Al2O3, 6SiO2) and calcium feldspar is ...
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Plagioclase - Wikipedia, the free encyclopedia
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en.wikipedia.org/wiki/Plagioclase
Plagioclase is an important series of tectosilicate minerals within the feldspar family. ... Feldspar - Bytownite Sodium calcium aluminum silicate Crystal Bay ...
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