Crystals
Found in minerals and have a regular geometric shape.
Geologists
Scientist who study rocks and minerals to help us learn about the formation of the earth.
Granite
Rock composed of the minerals: Quartz, Mica, and Feldspar.
Hardness
How resistant a mineral is to being scratched.
Igneous rocks
Formed from minerals that have melted deep within the Earth.
Luster
The way a mineral reflects light.
Magnetic minerals
Minerals which show magnetic properties. Two examples are magnetite and hematite.
Metamorphic rocks
Formed from igneous, sedimentary, or other metamorphic rocks which contain minerals that have been changed by heat, pressure, or chemical action.
Mineral
Occur in nature and have definite chemical compositions and physical properties. They are the raw materials of rocks.
Mohs Scale
Used by geologists to classify a given minerals hardness.
Rock
Earth materials made up of different kinds of minerals.
Scratch test
Used to determine the hardness of a mineral.
Sedimentary rocks
Formed as particles settle to the bottom of oceans and lakes.
Streak color
When an unknown mineral is rubbed against a streak plate, (unglazed piece of porcelain) it may produce a colored line if it is softer than the streak plate.
Streak plate
Unglazed porcelain material that is used to determine the streak color of a mineral by rubbing a mineral over its surface.