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How is a rock like a salad?. Physical Properties of Minerals. Color Some minerals only occur as one c olor . However, some minerals, s uch as quartz can be many different colors. Hardness A measure of how easily a mineral can be scratched. Measured on a

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How is a rock like a salad?

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How is a rock like a salad?


Physical Properties of Minerals

Color

Some minerals only occur as one

color. However, some minerals,

such as quartz can be many

different colors.

Hardness

A measure of how easily a mineral

can be scratched. Measured on a

Scale from 1 (softest) to 10 (hardest).

Streak

The color of powdered mineral.

Mineral is scraped across a

ceramic plate to create powder.

Streak and color are NOT always

the same (e.g., pyrite).

Luster

Describes the way a mineral

reflects light from it’s surface.

Either metallic or non-metallic.

Cleavage

When a mineral breaks to form one or more flat

surfaces it is said to have cleavage(e.g., mica).


Color


Luster – metallic or non-metallic

A.

Pyrite


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

SEDIMENTARY ROCK

Formed from pieces of solid materials

that have been deposited on Earth’s

surface. The solid pieces start out

as loose grains (e.g., sand) and are known

as sediment but become cemented

together to form solid rock

Weathering & Erosion

IGNEOUS ROCK

Formed when magma cools

Intrusive – magma that cools VERY slowly

usually deep in the earths crust

Extrusive – magma that cools VERY quickly

usually ejected from volcanoes

Burial

METAMORPHIC ROCK

Formed when rock is exposed to tremendous heat and

pressure. The rock is often deformed and the original

mineral crystals and/or grains recrystallize to form NEW

minerals

Melting


Igneous Rocks

Formed from cooled magma


Sedimentary Rocks

Formed from eroded sediment


Metamorphic Rocks

Formed by heat and pressure


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