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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
âorange calciteâ refers not to a distinct species, but to a color variety of the mineral calcite. As the most abundant of the 192 members of the carbonate class of minerals, calcite is a simple carbonate containing the elements calcium (Ca), carbon (C), and oxygen (O) in proportions of 40.04 percent calcium, 12.00 percent carbon, and 47.96 percent oxygen.