a. A descriptive term applied to those igneous rocks that contain more than 60% silica. Acidic is one of four subdivisions of a widely used system for classifying igneous rocks based on their silica content: acidic, intermediate, basic, and ultrabasic. AGI
b. Applied loosely to any igneous rock composed predominantly of light-colored minerals having a relatively low specific gravity. CF: felsic
Source: Dictionary of Mining, Mineral, and Related Terms












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