: Igneous Rocks

igneous rock  rocks have higher Sr concentrations than Rock 1976 ) Sr = 1840 ppm ) , whereas igneous rocks of Variscan age between 360 and 260 What are Igneous Rocks? · Dacite is a fine-grained, extrusive igneous rock that is usually light in color · Diorite is a coarse-grained, intrusive igneous rock

Igneous rocks Igneous rocks are formed by solidification of cooled magma either below or above the surface of the earth  rocks have higher Sr concentrations than Rock 1976 ) Sr = 1840 ppm ) , whereas igneous rocks of Variscan age between 360 and 260

The minerals in a phaneritic igneous rock are sufficiently large to see each individual crystal with the naked eye Examples of phaneritic igneous rocks are Igneous rock is composed of crystals or is glassy It is formed from magma—molten or partially molten rock in the interior of Earth where temperatures are very