review 1. what are the two mineral groups?1. what are the two mineral groups? 2. what does chemical...
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ReviewReview
• 1. What are the two 1. What are the two mineral groups?mineral groups?
• 2. What does 2. What does chemical chemical compositioncomposition mean? mean?
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How could you tell these How could you tell these minerals apart to determine minerals apart to determine which is which?which is which?
Fluorite
Talchalite
Topaz
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Identifying MineralsIdentifying Minerals
• Cornell Notes Page 141.Cornell Notes Page 141.
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(How can we identify which (How can we identify which mineral is which?)mineral is which?)
8 Ways to Identify 8 Ways to Identify MineralsMinerals
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1. Color1. Color
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Discuss- Discuss- why wouldn’t color be why wouldn’t color be the best way to identify minerals?the best way to identify minerals?
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2. Luster2. Luster• the way the the way the
mineral’s surface mineral’s surface reflects light. reflects light.
• metallic, earthy, metallic, earthy,
waxy, greasy, glassywaxy, greasy, glassy
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LusterLuster
• Resinous lusterResinous luster
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Discuss…Discuss…
• How is How is lusterluster different from different from colorcolor??
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3. Streak-- the color of the 3. Streak-- the color of the powderpowder
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Streak – the color of the powderStreak – the color of the powder
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Discuss…Discuss…
• How do you find a minerals How do you find a minerals streakstreak??
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-Cleavage-Cleavage -breakage occurs along smooth,flat surfaces
4. The way 4. The way the mineral the mineral breaksbreaks
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Examples of CleavageExamples of Cleavage
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--FractureFracture• Breakage Breakage
occurs in occurs in curved or curved or irregular irregular shapesshapes
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Discuss…Discuss…
• How are How are cleavagecleavage and and fracturefracture different? different?
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5. Hardness5. Hardness• resistance to resistance to
scratchingscratching
• Mohs Hardness Mohs Hardness Scale 1-10Scale 1-10
Diamond 1010
(Hardest)
Talc-- 11 ( (SOFTEST)
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Discuss…Discuss…
• What does What does hardnesshardness mean when referring mean when referring to minerals?to minerals?
• What scale do we use to measure What scale do we use to measure hardnesshardness??
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6. Density6. Density• Minerals have Minerals have
different densitiesdifferent densities
• How much MASS How much MASS something has in something has in relation to its sizerelation to its size
Pyrite= 5.01g/cm3
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7. Crystal 7. Crystal SystemsSystems• Minerals can Minerals can
form form different different shaped shaped crystals with crystals with varying varying numbers of numbers of sides.sides.
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8. Special Properties8. Special Properties• Some properties only Some properties only
apply to a few types of apply to a few types of mineralsminerals
• Fluorescence• Magnetism• Chemical Reactions• Taste• Optical Properties• Radioactivity
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example of optical propertiesexample of optical properties
Calcite
Quartz
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ReviewReview
• 1. What is a 1. What is a mineral’s streak?mineral’s streak?
• 2. What are 7 2. What are 7 other ways to ID other ways to ID minerals?minerals?
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Your House Comes From a MineYour House Comes From a Mine
ClayClay1.1.2.2.3.3.4.4.
LimestoneLimestone1.1.2.2.
CopperCopper1.1.
GypsumGypsum1.1.
IronIron
1.
2.
3.
4.
5.
6.
PetroleumPetroleum
1.
2.
3.
4.
5.