What is a luster?

• the color of a rock

• the texture of a rock

• how a rock reflects light

Sam has a rock and can scratch it with his fingernail. What could be the hardness of the rock?

• 3

• 2

• 10

Which one has a metallic luster?

• granite

• gold

• quartz

• gypsum

Cohen is trying to classify a group of rocks. He is using a nail to scratch the rock. What is he using to classify the rocks?

• texture

• hardness

• color

• luster

Which 2 properties of rocks can be observed without touching the rocks?

• luster and texture

• texture and hardness

• color and luster

Knox classified some rocks. He placed copper and silver in one group. He put talc and gypsum in another group. Which property did he use to classify the rocks?

• shape

• weight

• luster

A hand lens is best used to classify rocks using which property.

• size

• hardness

• texture

The grain size of a rock describes which property.

• texture

• color

• hardness

This is testing the ________.

• hardness

• streak

• color