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This is the introduction to the rocks unit.
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RocksRocks&&
MineralsMinerals
Minerals
Minerals
Minerals are neither plant nor animal and occur naturally.
Minerals are the building blocks of rocks.
There are four ways we identify minerals Color, luster, streak, and hardness.
Mineral Color
Color is one way we identify minerals Problems:
Some minerals can be more than one color Many minerals may be the same color.
Quartz Fluorite
Minerals
Streak Streak color is
sometimes different than the solid color.
Usually the streak is the same.
Minerals
Hardness Anything that scratches a mineral is
harder than the mineral.
Mr. Scott will talk about this page.
Igneous Rocks Fire Made
Cooled magma Cools slowly – big grains (crystals)
Cools quickly – tiny grains (crystals)
Cools instantly – no grains (glass)
Sedimentary Rocks
Rocks formed from bits or layers of rocks cementer together.
When rocks are weathered they break into tiny pieces.
When the tiny pieces are eroded they eventually get deposited. Sediments are deposited rock pieces. Sediments – water – air = rocks
Metamorphic Rock
A rock that has been changed from one kind of rock into another kind of rock. Heat & pressure Creates mineral bands
Rock Cycle