mineral, naturally occurring inorganic solid with definite chemical composition and an orderly arrangement of atoms, silicate, member of mineral group with silicon and oxygen in its crystal structure, crystallization, when particles dissolved in a liquid solidify and form crystals, magma, molten rock stored beneath Earth's surface, lava, molten rock that has erupted on or near Earth's surface, mineralogists, scientists who study minerals, luster, way a mineral reflects or absorbs light, streak, color of a mineral in powdered form, hardness, resistance of a mineral to being scratched, cleavage, if a mineral breaks with smooth, flat surfaces, fracture, if a mineral breaks and forms uneven surfaces, density, an object's mass divided by its volume

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