Week 2 Soil minerals

bedrock

foundation; forms the parent material

regolith

broken down bedrock

minerals

naturally occurring, chem. composition, inorganic, crystalline structure

primary minerals

mineral that hasn't been altered

secondary minerals

formed through chemical rxns; been altered

Oxide minerals

-Contain metal and oxygen

- most common in soil

- most are secondary minerals

- very resistant to leeching

Si-O

tetrahedral

Fe-O

Octahedral

Strongest resistance to weathering

metal oxides

Strongest leeching

metal oxides

red soils

it is old

since iron composition

Iron oxides

- most abundant oxides in soils

Silicate minerals

- dominate earth crust

- form at different temperatures which impacts stability in soils

- most common in sand size

classified on tetrahedral arrangement

COLE

coefficent of linear extensibility; used in soils with mud cracks

clay charge

negative