Coal, graphite and diamonds are all made of ______________.

• carbon

• coal

• carbon fiber

• feldspar

Every mineral can form as a ______________ with a regular geometric shape.

• crystal
• box
• circle
• rock

Minerals tend to _________ along a plane, or cleave, along flat surfaces parallel to the crystal face.

• break
• bond
• smell
• increase in size

Hardness is a measure of the ability of a mineral to resist being ______________.

• scratched

• touched

• moved

• burnt

The mineral __________ is used in making ships and paper clips.

• feldspar
• iron
• diamond
• steel

There are more than ___________ different minerals on Earth.

• 1000
• 2000
• 3000
• 300

The Mohs hardness scale rates minerals from a #1 (soft) to a #____ (hardest).

• 7
• 8
• 9
• 10

A _________ is the only mineral that no other mineral can scratch it.

• feldspar
• diamond
• talc
• gypsum

______________ is a mineral that is used for sandpaper because it has a hardness of #9.

• corundum
• diamond
• feldspar
• quartz

A copper penny has a hardness of ______ .

• 1
• 2
• 3
• 4