1. Rocks And Minerals

2. Rocks and Minerals A.Mineral – inorganic solid materials with a particular chemical makeup and orderly arrangement of atoms 1. Rocks are usually composed of two or more minerals.

3. Rocks and Minerals 2. Minerals form from magma or lava or through a evaporation or precipitation. 3. Mineral formation clues include size and how crystals fit together.

4. Rocks and Minerals B. Properties – characteristics used to identify minerals 1. Solid materials with a repeating pattern of atoms called crystals.

5. Rocks and Minerals 2. Some minerals have cleavage, splitting into thin sheets; other minerals have fractures, breaking into rough edges. 3. Color or streak (color of a powdered mineral) helps identify minerals.

6. Rocks and Minerals 4. Luster describes how light reflect from a minerals’ surface. 5. Mohs scale uses hardness to classify minerals from 1 (softest) to 10 ( hardest).

7. Rocks and Minerals 6. Specific gravity -compares weight of mineral with weight of an equal volume of water. 7. Other properties of minerals include magnetism, double refraction, taste, or reactions with acid.

8. Rocks and Minerals C. Common minerals- most rock- forming minerals are silicates, or carbonates. 1. Rare minerals which can be cut and polished are gems. 2. Diamonds are produced under pressure beneath Earth’s surface and brought to the surface by special volcanic eruptions.

9. Rocks And Minerals 3. An ore contains enough useful mineral to be sold at a profit. 4. Ores must be processed to extract the mineral.

10. Rocks And Minerals