Identifying Minerals There are 6 specific properties examined to identify a mineral………

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Identifying Minerals There are 6 specific properties examined to identify a mineral………

1. Color Many minerals have a distinct color, but the color alone is not enough to identify the mineral.

2. Luster The way a mineral reflects light. Metallic – Reflects light and looks metallic. Nonmetallic – Minerals that look earthy, waxy, or glasslike.

3. Streak The powdered form of the mineral. The streak of a mineral is obtained by rubbing it on a streak plate. Often the color of the powder will be different than the whole mineral.

4. Hardness How hard the mineral is. Measured on the Moh’s scale. 10 is the hardest mineral – a diamond. 1 is the softest mineral – talc.

The Moh’s Scale

5. Breakage The way a mineral breaks. Cleavage – smooth, flat breaks. Fracture – Rough, jagged breaks.

6. Shape Minerals have 6 general crystal shapes. Cubic Hexagonal Tetragonal Orthorhombic Monoclinic Triclinic

Cubic Pyrite

Hexagonal Hanksite

Tetragonal Cassiterite

Orthorhombic Antlerite

Monoclinic Gypsum

Triclinic Axinite

Name the Crystal Shape

A Quick Review All minerals share the following 4 characteristics: Solid, Inorganic, Naturally Formed, Crystalline Structure. There are 6 tests to identify a mineral. Color, Hardness, Breakage, Streak, Shape, Luster.