Feldspar - Chemical composition: All the rock-forming feldspars are aluminosilicate minerals with the general formula AT4O8 in which A = potassium, sodium, or calcium (Ca); and T = silicon (Si) and aluminum (Al), with a Si:Al ratio ranging from 3:1 to 1:1. Microcline and orthoclase are potassium feldspars (KAlSi3O8), usually designated Or in discussions involving their end-member composition.
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The basic feldspar recipe is X(Al,Si) 4 O 8, where X stands for Na, K or Ca. The exact composition of the various feldspar minerals depends on what elements balance the oxygen, which has two bonds to fill (remember H 2 O?). Silicon makes four chemical bonds with oxygen; that is, it's tetravalent.
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Start studying Chapter 3 Minerals. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. ... Is a color a good way to distinguish between orthoclase and plagioclase feldspar? If not, what is? ... (Potassium Feldspar) K ions, light cream to salmon pink, no striations, two 90 cleavages. Quartz (Silica) ...
Solid solutions between albite and anorthite are called "plagioclase", or more properly "plagioclase feldspar". Only limited solid solution occurs between K-feldspar and anorthite, and in the two other solid solutions, immiscibility occurs at temperatures common in the crust of the Earth. Albite is considered both a plagioclase and alkali feldspar.
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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 potassium feldspar, also known as K-feldspar.
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Apr 25, 2017· Feldspar is the principle ground mineral of granite, monzonite and syenite. It makes up approximately 60-percent of these igneous rocks and gives granite its porphyritic texture (a mix of large grains with intersticial smaller grains). Feldspars are further divided into two types. They are easily identifiable in both ...
K.s. HEIER Dept. of Geology, Rice University, Houston, Texas. [l] Introduction Most of the work on feldspars during the recent years has been concerned with structural arguments and the problem of the relative stabilities of the different polymorphic forms of the feldspar minerals. The word "polymorphs" implies, of course, different structural ...
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