Rocks and Minerals Vocabulary (SML)

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Cleavage

The tendency of a mineral to break along straight lines

Fracture

A break in a mineral that is not in a regular way

Luster

The way a mineral reflects light.

Density

A measure of how much mass in an amount of space

Color

Most obvious property of a mineral, but not always accurate

Streak

The color a mineral leaves in powdered form

Hardness

How easily a rock can be scratched

Igneous rock

Rock formed when meted rock cools and hardens

Sedimentary rock

Rock formed when sediment is cemented together

Metamorphic rock

Rock formed by heat & pressure

Magma

Melted rock underneath the surface of the Earth

Lava

Melted rock on the surface of the Earth

Fossil

Remains of plants and animals

Rock

A nonliving solid made of more than one mineral

Mineral

a nonliving solid that naturally occurs in a crystalline form.