do now: what is the difference between lemon juice and...
TRANSCRIPT
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AIM:
What is the difference
between a rock and a
mineral? What are the
properties of minerals?
DO NOW: What is the difference
between lemon juice and lemonade.
Notepack # 14 November 15, 2016
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Introduction – Comparing Minerals to Rocks
• Mineral
– Naturally occurring
– Inorganic
– Characteristic chemical composition
– Ordered atomic structure
– Specific physical properties
• Rock
– Naturally occurring
– Can be organic
– Can have multiple chemical compositions
– Physical properties can change
– Composed of minerals
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What are Minerals? • Minerals are substances that
are pure and are made of only one kind of molecule.
• Minerals have unique properties that do not change when it is under pressure or heat.
• Minerals have 6 major properties or characteristics: Luster, Color, Streaking, Hardness, Crystal Structure, and Cleavage.
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Minerals Properties
• Properties of Minerals
– Luster • The way light reflects off a
mineral
• Metallic
– Looks like metal
• Non-Metallic
– Doesn’t look like metal
– Can still be shiny
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Mineral Properties
• Color – Not a great way to
identify minerals
– A mineral’s color can change considerably • Rose Quartz vs. regular
Quartz vs. green quartz
• Red Hematite vs. Silver Hematite
– Many minerals have the same color • Halite and Calcite can
both be clear
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Mineral Properties
• Streak
– The color of the powdered form
– A mineral’s color can change but streak will typically remain the same
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Mineral Properties
• Hardness
– Resistance to scratching • Harder minerals will
scratch softer minerals
– Measured on Moh’s Hardness scale • 1 – soft
– Talc
• 10 – Hard
– Diamond
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Mineral Properties
• Crystal Structure
– Many minerals have a characteristic shape • Ex:
– Diamond
– Galena
– Calcite
– Halite
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Mineral Properties
• Cleavage
– How a mineral breaks
– A minerals shows cleavage if it breaks: • evenly
• with a specific shape
• with flat sides
• Fracture
– Opposite of cleavage
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Minerals
• Gemstone
– Precious or semi-precious stone
– Valuable due to color, luster, hardness….
– Some gemstones are rocks, but most are minerals
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What are Rocks?
• Rocks are formed as a results of the combination of minerals they have in them.
• Rocks are classified by how they are formed.
• Unlike minerals, rocks can change into other rocks if under pressure and heat.
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Categories of Rock
• Rocks are separated into 3 categories:
– Igneous rock – new rock that is form straight from the mantle.
– Sedimentary rock – rock that is produced as the result of the weathering or erosion of old rock which piles up on itself.
– Metamorphic rock – rock the change as the results of extreme heat and pressure.
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Igneous Rocks
• Volcanic Rocks
– Form from solidification or cooling of: • Lava
– Liquid rock on earth’s surface
• Magma
– Liquid rock inside the earth
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Types of Igneous Rocks • Intrusive
– Form inside the earth
– Solidify slowly
– Allows mineral crystals time to grow • Shows large mineral
grains (crystals)
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Types of Igneous Rocks
• Extrusive – Forms on the earth’s
surface
– Cools quickly
– Doesn’t allow crystals time to form
– Can show a glassy texture • Can be shiny, but doesn’t
have to be
• Glassy simply means no crystals whatsoever
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Types of Igneous Rocks
• Vesicular
– Forms from lava that’s being disturbed
– Gas is bubbling out of the lava
– Rock shows gas pockets (holes)
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Sedimentary Rocks
• Form different ways, but most are associated with:
– Weathering, erosion, deposition with water
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Types of Sedimentary Rocks
• Clastic Sedimentary Rocks
– Contains pieces of other rocks
– Form when other rocks become weathered, eroded, and then the pieces are cemented together
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Types of Sedimentary Rocks
• Chemical Sedimentary Rocks (Crystalline)
– Forms when minerals are left over after seawater evaporates
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Metamorphic Rocks
• Form when other rocks undergo heat and pressure
– Called metamorphism
– Results in a recrystallization of rocks • Can have mineral crystals
like igneous rocks
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Types of Metamorphic Rocks
• Foliated
– Crystals have been re-arranged in bands or layers
– Can look like cleavage planes • But remember only
minerals show cleavage, not rocks
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Types of Metamorphic Rocks
• Non-Foliated
– No bands/layers
– Can be difficult to tell a non-foliated metamorphic rock from igneous rock
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The Rock Cycle
• Rocks are classified by how they form
• Any rock can turn into any other rock
• The Rock Cycle Chart shows how rocks form and change over time
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