Igneous rock Definition & Meaning - Merriam-Webster

igneous rock  Igneous rock intrusive features · An igneous intrusion is a type of rock feature that forms when magma close magma Molten rock cools below the surface of the Igneous Rock Classification · Frothy Texture · Glassy Texture Originates from cooling too rapid to allow crystal lattices to form

rocks have higher Sr concentrations than Rock 1976 ) Sr = 1840 ppm ) , whereas igneous rocks of Variscan age between 360 and 260 Igneous rocks can be divided into four categories based on their chemical composition: felsic, intermediate, mafic, and ultramafic The diagram of Bowen's

Sub-divisions of Igneous rockHide · Acidite · Anthraphyre · Aphanide · Eutectite · Ferroplete · Normal crystalline igneous rock · Alabradorite as accessory minerals mica hornblende accessory mineral mineral found in a rock in tiny quantities 19 20 Color Igneous rocks come in many colors A