andesite, quartz latite, quartz trachyte, and dacite. So, a feldspar porphyry really just boils down to igneous rock. Mafic modifiers (feldspar biotite porphyry, or feldspar hornblende porphyry etc.) ...
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Black Butte, about a 10-mile drive northwest from Mt. Shasta, “is a steep, nearly treeless dome of hornblende andesite,” or volcanic rock, according to the U.S. Department of Agriculture ...
Rio Bravo is located 112 km south- east of Lima, in the province of Yauyos, and east of the city of Cañete, in the part of the prolific South-Central Peru porphyry copper-molybdenum belt.
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