Earth Science Rocks
The 8 most
common elements in the earth's crust are Oxygen,
Silicon, Aluminum, Iron, Calcium, Sodium,
Potassium, & Magnesium. They compose 98.5%
of the total crust. A mineral occurs naturally, is a
soli, inorganic, has chemical composition and a
crystalline structure. Native minerals are single
elements. Compounds are 2 or more. There are
more compound than native. You can identify
minerals by color, streak, luster, hardness,
cleavage, and fracture. Minerals form by magma
erupting and forming lava then cooling. They can
also form by evaporation of water containing
dissolved ions. Silicates are the most common
group of minerals found in the earth's crust. The
structure of minerals are orderly. They form
crystalline. A crystalline has flat faces and smooth
surfaces. Igneous rocks are formed from magma.
If they are intrusive (plutonic), they have large
crystals and cooled slowly. If they are extrusive,
they cool quickly, have fined grain. The scheme
for igneous......
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