Dacite Properties, Composition and Uses
Dacite is a fine-grained, light-colored volcanic rock with a felsic composition. Felsic means they are silica-rich and dominated by light-colored
Dacite is a fine-grained, light-colored volcanic rock with a felsic composition. Felsic means they are silica-rich and dominated by light-colored
Dacite and andesite are fine-grained volcanic or extrusive igneous rocks. These rocks form when magma cools rapidly on the Earth’s
Monzonite is a coarse-grained, plutonic, or intrusive igneous rock with intermediate composition. Plutonic or intrusive rocks form deep inside the
Quartz monzonite is a coarse-grained, felsic plutonic, or intrusive igneous rock. Felsic rocks are light-colored rocks rich in lighter elements
Pyric (US) or porphyritic texture is an igneous rock texture with two distinctive crystal sizes, i.e., bimodal crystal sizes. One
A porphyry (plural) is an igneous rock with large, well-formed mineral grains set in a finer-grained matrix. Such rocks have
Porphyritic andesite rocks have large, well-formed crystals or phenocrysts of mostly plagioclase and, less often, hornblende and pyroxene. Less common
Porphyritic rhyolite has large, well-formed crystals, mostly alkali feldspar, plagioclase, quartz, and less often hornblende, pyroxene, or mica in a
Porphyritic basalt rocks have large, well-formed grains of calcic plagioclase, augite, olivine, and sometimes hornblende in fine-grained dark-gray to black
Porphyritic granite has large, well-formed white or pink alkali feldspar and sometimes quartz, biotite, or plagioclase in a finer but