Rocks and Minerals

Why do geologist use the Mohs hardness scale for?

• Relative Hardness.. ( not an absolute)

• Rub on unglazed surface

• The streak test

Luster means to reflect light.

• True

• False

Minerals can be classified as ?

• Physical Properties

• Streak color

• Luster

• Fracture

Whaaat does Cleavage mean.?

• Reaction to acid

• Color of crushed powder

• To split

• Glassy

What does weathering mean?

• Dropping off sediments

• Rocks getting layered

• The braking down

• Getting squeezed

What does cementation mean?

• Squeezing sediments together.

• Allowing metals into earth core

• Layered rock

• Sticks sediments together

What is metamorphic rock

• Formed by heat and pressure

• Layered sediments

• Sediments being broken down

• Cementation

What is igneous rock

• Unique combo of solid minerals

• Magma heats undergound

• Rocks all change

• Sticks sediments together

What is a mineral comp

• A unique combo of soild elements and compounds that make up a mineral.

• Earth was partly molten; allowing dense metals sink to the core

• Change from one rock to another

• Molten rocks or magma

What mineral is the hardest

• Talc

• Flourite

• Diamond

• Calcaite