Review 1. What are the two mineral groups?1. What are the two mineral groups? 2. What does chemical composition mean?2. What does chemical composition.

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Presentation transcript:

Review 1. What are the two mineral groups?1. What are the two mineral groups? 2. What does chemical composition mean?2. What does chemical composition mean?

How could you tell these minerals apart to determine which is which? Fluorite Talc halite Topaz

Identifying Minerals Cornell Notes Page 141.Cornell Notes Page 141.

(How can we identify which mineral is which?) 8 Ways to Identify Minerals

1. Color

Discuss- why wouldn’t color be the best way to identify minerals?

2. Luster the way the mineral’s surface reflects light.the way the mineral’s surface reflects light. metallic, earthy, waxy, greasy, glassymetallic, earthy, waxy, greasy, glassy

Luster Resinous lusterResinous luster

Discuss… How is luster different from color?How is luster different from color?

3. Streak-- the color of the powder

Streak – the color of the powder

Discuss… How do you find a minerals streak?How do you find a minerals streak?

-Cleavage -breakage occurs along smooth,flat surfaces 4. The way the mineral breaks

Examples of Cleavage

-Fracture Breakage occurs in curved or irregular shapesBreakage occurs in curved or irregular shapes

Discuss… How are cleavage and fracture different?How are cleavage and fracture different?

5. Hardness resistance to scratchingresistance to scratching Mohs Hardness Scale 1-10Mohs Hardness Scale Diamond 10 ( Hardest) 1 ( Talc-- 1 ( SOFTEST)

Discuss… What does hardness mean when referring to minerals?What does hardness mean when referring to minerals? What scale do we use to measure hardness?What scale do we use to measure hardness?

6. Density Minerals have different densities How much MASS something has in relation to its size Pyrite= 5.01g/cm 3

7. Crystal Systems Minerals can form different shaped crystals with varying numbers of sides.Minerals can form different shaped crystals with varying numbers of sides.

8. Special Properties Some properties only apply to a few types of mineralsSome properties only apply to a few types of minerals Fluorescence Magnetism Chemical Reactions Taste Optical Properties Radioactivity

example of optical properties Calcite Quartz

Review Review 1. What is a mineral’s streak?1. What is a mineral’s streak? 2. What are 7 other ways to ID minerals?2. What are 7 other ways to ID minerals?

Your House Comes From a Mine Clay Limestone1.2.Copper1.Gypsum1. Iron Petroleum