Minerals Section 1 Minerals.

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Presentation transcript:

Minerals Section 1 Minerals

Mineral—four characteristics Naturally occurring—formed by processes on or inside Earth with no input from humans Inorganic—not made by life processes Element or compound with a definite chemical composition Orderly arrangement of atoms; all minerals are crystalline solids

Crystal—solid with atoms arranged in orderly, repeating patterns Some crystals form from magma, hot melted rock below the Earth’s surface When magma cools slowly, crystals are large When magma cools quickly, crystals are small Crystals can form from solutions as water evaporates or if too much of a substance is dissolved in water.

Mineral groups are defined by their composition. Silicates contain silicon, oxygen, and one or more other elements; they include most common rock-forming minerals. Silicon and oxygen are the two most abundant elements in Earth’s crust; they form the building blocks of many minerals.

Section 2 Mineral Identification Minerals Section 2 Mineral Identification

Color and appearance are not enough to distinguish most minerals. Hardness is a measure of how easily a mineral can be scratched; the Mohs scale compares mineral hardness.

The way a mineral reflects light is its luster. Can be metallic or nonmetallic Nonmetallic lusters include dull, pearly, silky, and glassy

Specific gravity is the ratio of a mineral’s weight to the weight of an equal volume of water; expressed as a number. Streak is the color of a mineral in powdered form, but the streak test is useful only for minerals softer than the streak plate.

The way a mineral breaks can be a distinguishing characteristic. Minerals with cleavage break along smooth, flat surfaces. Minerals with fracture break with uneven, rough, or jagged surfaces. Some minerals have unique properties that involve light or magnetism.

Section 3 Uses of Minerals

Gems—rare and beautiful minerals that are highly prized. The Cullinan diamond and the Hope diamond are famous historical gems. Gems have industrial applications in abrasives, lasers, and electronics.

Minerals can contain other useful elements An ore is a mineral or rock containing a substance that can be mined at a profit. Elements must be refined, or purified, from ores. Some elements dissolve in fluids, travel through weakness in rocks, and in those weaknesses form mineral deposits called vein mineral deposits. Titanium is a useful element derived from the minerals ilmenite and rutile.