Pyroxene mineral having equal amounts of cao and feo
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Explanation:
The minerals that make up igneous rocks crystallize at a range of different temperatures. ... with some of the silica in the magma (see Box 3.1) to form pyroxene. ... Mafic magmas have 45% to 55% SiO2, about 25% total of FeO and MgO plus ... The proportions of the main chemical components of felsic, intermediate, and ...
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Explanation:
An increased Mg/Fe ratio in mafic minerals together with increased Ca/Na and K/Na .... by affiliation of the equivalent amount of FeO and MgO to olivine, which contains less SiO2
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