1. Chapter 3: Minerals of the Earth’s Crust Standard: Composition of rocks in terms of minerals

2. What are the 2 kinds of minerals? Silicates Contain: Silicon Oxygen Metal Non-Silicates Do Not contain: – Silicon – Oxygen

3. EQ: How are minerals identified? Color Luster Streak But, may vary The way a surface reflects light Shiny means metallic Dull means a non-metal The color of a mineral in powdered form; Does NOT change

4. How are minerals identified? Cleavage Fracture Breaks along smooth, flat surfaces Ex: Mica Breaks unevenly along curved or irregular surfaces Ex: Quartz

5. How are minerals identified? Hardness Density Resistance to being rubbed Mohs Hardness Scale of 1 – 10 ; talc =1, diamond= 10 Ratio between mass & volume Written as g/ml or g/cc

6. How are minerals identified? Special Properties Fluorescence Chemical reaction Optical properties Magnetism Taste Radioactivity

7. EQ: How are minerals identified? Answer Section 2 Review Page 73, # 1-8