RocksRocks are aggregates of minerals

Identification of Rocks is by texture and compositionTexture is the size, shape and arrangement of grainsComposition is the minerals in the rock.

Grain SizeFine

Medium

Coarse

Glassy

Arrangement - Cemented

Arrangement - Interlocking

Arrangement - Foliated

Arrangement - Frothy

04_02.jpgIgneous Rocks cooling of magma or lava. Intrusive and ExtrusiveComposition: silicic, mafic, intermediate

Sedimentary RocksClastic cemented fragmentsCarbonates cemented shell fragmentsChemical precipitated from water interlockingComposition (Minerals): calcite, dolomite, quartz, halite

Regional Metamorphism - Foliation

06_17.jpgContact Metamorphism of LimestoneLimestoneMarble