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Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock.
Note that fused quartz has a very different and lower refractive index compared to crystalline quartz which is birefringent with refractive indices n o = 1.5443 and n e = 1.5534 at the same wavelength. Although these forms have the same chemical formula, their differing structures result in different optical and other physical properties.
Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...
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Boise State will rue all their missed chances in Tuesday’s Fiesta Bowl, and their inability to keep Penn State from converting time after time in the Nittany Lions’ 31-14 victory on New Year ...
Ohio State will meet Notre Dame for the national title. The Buckeyes defense stopped Texas near the goal line with less than three minutes to go as Jack Sawyer’s fumble return with 2:13 ...
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