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The two most abundant elements in Earth's continental crust are _____. oxygen and silicon Which major non-silicate rock forming mineral is the primary constituent of the rock limestone? calcite Which of the following is the least abundant of the eight rock forming elements that make up most of the continental crust? iron; oxygen; aluminum; calcium; magnesium
Common Minerals in Igneous Rocks The mineral samples in this section are generally pure mineral specimens. Such pure mineral samples are not commonly found in the wild, but they still illustrate the basic properties displayed by their smaller counterparts in igneous, sedimentary, and metamorphic rocks.