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Earth Science Rocks The 8 most common elements in the earth's crust are Oxygen, Silicon, Aluminum, Iron, Calcium, Sodium, Potassium, & Magnesium. They compose 98.5% of the total crust. A mineral occurs naturally, is a soli, inorganic, has chemical composition and a crystalline structure. Native minerals are single elements. Compounds are 2 or more. There are more compound than native. You can identify minerals by color, streak, luster, hardness, cleavage, and fracture. Minerals form by magma erupting and forming lava then cooling. They can also form by evaporation of water containing dissolved ions. Silicates are the most common group of minerals found in the earth's crust. The structure of minerals are orderly. They form crystalline. Approximate words: 296 Approximate pages: 2

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