Though it often contains significant amounts of feldspar and quartz, gneiss is an extremely various type of rock. Thus, in order to more adequately describe a specific gneiss, the rock is frequently classified according to a number of more restrictive systems. Many of the common categorizations of the rock are based upon chemical composition, parent material, or mineral constituents. Gneiss diopside is an example of this latter type of categorization. |
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