Rocks and Minerals

What is Hardness?

• The tendency of a mineral to split easily along flat surfaces.
• A measure of how easily a mineral can be scratched.
• The way a mineral shines, or reflects light.

What is Luster?

• The color of a mineral when it is ground into a powder.
• A measure of how easily a mineral can be scratched.
• The way a mineral shines, or reflects light.

What is a Mineral?

• A nonliving solid material that has a definite chemical make up and is found in Earth's outermost layer.
• A measure of how easily a mineral can be scratched.
• The way a mineral shines, or reflects light.

What is a Streak?

• The tendency on a mineral to split easily along flat surfaces.
• A measure of how easily a mineral can be scratched.
• The color of a mineral when it is ground into a powder.

Another way to test hardness is...

• Mineral scale
• Moh's scale
• Streak scale

What is a metallic mineral?

•  A mineral that splits into thin sheets.
• A mineral that is shiny like metal.
• A mineral that is dull or glassy.

What is an igneous rock?

• Rock that forms when melted, or molten rock from deep below Earth's surface cools and hardens.
• A solid material made up of one or more minerals.
• Rock that forms when existing rocks are changed by heat, pressure, or chemicals beneath the Earth's surface.

What is metamorphic rock?

• Rock that forms when melted, or molten rock from deep below Earth's surface cools and hardens.
• A solid material made up of one or more minerals.
• Rock that forms when existing rocks are changed by heat, pressure, or chemicals beneath the Earth's surface.

What is a rock?

• Rock that forms when melted, or molten rock from deep below Earth's surface cools and hardens.
• A solid material made up of one or more minerals.
• Rock that forms when existing rocks are changed by heat, pressure, or chemicals beneath the Earth's surface.

This rock was formed by smaller pieces of rock that settled at the bottom of a lake millions of years ago. What type of rock is this?

• Sedimentary
• Igneous
• Metamorphic