The Mineralogy of Arizona

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Microcline. This mineral, which has the same chemi- cal composition as orthoclase, with slightly different crystalline structure, has been observed as a microscopic constituent in the tourmaline aplites found in the vicinity of Oracle, in the Catalina mountains.
Plagioclases The plagioclase feldspars differ from orthoclase in composition and crystallization. Chemically they are isomorphous mixtures of albite, NaAlSi 3 O 8, and anorthite, CaAl 2 Si 2 O 8, different proportions of these two molec
...ules giving rise to the rather arbitrary varieties, oligoclase, andesine, loboradorite and bytownite. They are all rock-forming minerals and are found in diorites, 58 TH MINERALOGY OF ARIZONA gabbros, and their eruptive equivalents, andesites and basalts. Andesites are probably the most common erup- tive in the Territory, and as constituents of these the plagioclases or triclinic feldspars are very abundant.
Pyroxene Pyroxene, the common variety of which is augite, is a complex silicate of calcium, magnesium, iron, etc.


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