Chapter 20 study guide.

Mineral
Chemical composition and a characteristic set of physical proprieties.

Cleavage
physical property that it to break along planes that cut across relatively weak chemical bonds.

Fracture
a physical property break in many places.

Hardness
hardness of mineral that measures resistance.

Streak
color of mineral in powered form.

Magma
molten rock in earth.

Rock
mixture of minerals.

Texture
size and arrangement of rocks.

IIR
coarse grained rock formed.

EIR
rock formed rapidly.

Clast
bits and pieces of rock that vary widely in size and composition.

Porosity
empty spaces in sedimentary rocks.

Cementation
sedimentary rock-forming process in which minerals precipitate out of water and fill the spaces between clasts.

Foiltated
type of metamorphic rock.

Rock Cycle
continuous process that forms and changes rocks on earths surfaces and deep below the surface.