Identifying Minerals

The way a surface (of a mineral) reflect light. Either metallic or nonmetallic:

• Cleavage
• Streak
• Luster
• Reflection

Many minerals form from the cooling of magma. If the magma cools slowly, what size are the crystals?

• small
• large
• no crystals

____________ is determined by scratching a mineral with other minerals.

• fracture
• hardness
• streak
• color

The tendency for a mineral to split along specific planes of weakness to form, smooth flat surfaces.

• Cleavage
• Fracture
• Crystallization
• Fracture

The color of the powdered form of a mineral found by rubbing a mineral against a white tile.

• Luster
• Cleavage
• Streak
• Fracture

The color of the powdered form of a mineral found by rubbing a mineral against a white tile.

• Luster
• Cleavage
• Streak
• Fracture

Which of the following is NOT a characteristic of a mineral?

• streak
• crystal structure
• inorganic
• chemical composition

Quartz, feldspar and Mica are silicate minerals. Silicate minerals contain atoms of silicon and oxygen and often other elements bonded together. What must be true of silicate minerals?

•   They are pure elements
• They are made up of compounds
• They melt at very low temperatures
• They are made up of only one kind of atom

What is the scale that is used to indicate hardness of a mineral?

• Red Scale
• Moh's scale
• Einstein Scale
• Fracture Scale

Which of the following must be true for a substance to be considered a mineral?

• It must be organic
• It must be glassy
• It must be a gem
• It must be naturally occurring