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tonalite
tonalite (ˈtəʊnəˌlaɪt) nan igneous rock found in the Italian AlpsTonalite
tonalite[′tōn·əl‚īt] (petrology) quartz diorite Tonalite a plutonic rock similar in composition to quartzmica diorite. Tonalite is about 33 percent neutral plagioclase, about 16 percent quartz, about 26 percent the colored mineral hornblende, and about 20 percent the colored mineral biotite. Accessory minerals include apatite, zircon, and sphene. Tonalite is used as a building stone, in particular, as an ornamental stone. |