minerals - a solid inorganic substance occurs naturally, crystalline - having the structure and form of a crystal; composed of crystals, extrusive rocks - relating to or denoting rock that has been extruded at the earth's surface as lava or other volcanic deposits., magma - hot fluid semi-fluid material within the earth's crust from which lava and other igneous rock is formed on cooling, basalt - a dark fine-grained volcanic rock that sometimes displays a columnar structure, granite - a very hard, granular, crystalline, igneous rock consisting mainly of quartz, mica, and feldspar and often used as a building stone, crust - the outermost layer of rock of which a planet consists, especially the part of the earth above the mantle, intrusive rocks - form beneath the Earth's surface when magma cools and solidifies slowly within the Earth’s crust,

Igneous rocks

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