How is a rock like a salad?

Physical Properties of MineralsColorSome minerals only occur as onecolor. However, some minerals,such as quartz can be manydifferent colors.

StreakThe color of powdered mineral.Mineral is scraped across aceramic plate to create powder. Streak and color are NOT alwaysthe same (e.g., pyrite).

CleavageWhen a mineral breaks to form one or more flatsurfaces it is said to have cleavage(e.g., mica).

LusterDescribes the way a mineral reflects light from it’s surface.Either metallic or non-metallic.

HardnessA measure of how easily a mineralcan be scratched. Measured on aScale from 1 (softest) to 10 (hardest).

Color

Luster – metallic or non-metallic

Pyrite

A.

Streak – the color of powdered rock

Mineral Identification

Mineral A

Color:

Lustre:

Streak:

Answer

Mineral B

Color:

Lustre:

Streak:

Answer

Mineral C

Color:

Lustre:

Streak:

Answer

The Rock Cycle: Rock Types and Processes

IGNEOUS ROCKFormed when magma coolsIntrusive – magma that cools VERY slowlyusually deep in the earths crustExtrusive – magma that cools VERY quicklyusually ejected from volcanoes

SEDIMENTARY ROCKFormed from pieces of solid materialsthat have been deposited on Earth’ssurface. The solid pieces start outas loose grains (e.g., sand) and are known as sediment but become cemented together to form solid rock

Weathering & Erosion

METAMORPHIC ROCKFormed when rock is exposed to tremendous heat andpressure. The rock is often deformed and the original mineral crystals and/or grains recrystallize to form NEWminerals

Burial

Melting

Igneous RocksFormed from cooled magma

Sedimentary RocksFormed from eroded sediment

Metamorphic RocksFormed by heat and pressure