Science TEKS K.7A

According to its number on Moh's Hardness Scale, which one of these rocks is the softest?

• Quartz (7)

• Mica (2)

• Feldspar (6)

• Talc (1)

What was the purpose of the scratch test on a mineral?

• to find if the rock contained calcite

• to find the hardness of the mineral

• to find the color

What properties are the most reliable for identifying minerals?

• Luster and Streak

• Color and Size

• Shape and Hardness

• Steak and Hardness

A mineral is...

• solid material made from many different kinds of rocks

• a solid matter formed in nature and found in earth materials (rocks)

• made from layers of sediment

• formed from heat of magma

Tags

NGSS.MS-ESS3-1

The color of a mineral in powder form is called the mineral's 

• hardness

• specific gravity

• luster

• streak

How light reflects off of a mineral is called the mineral's 

• luster

• streak

• cleavage

• fracture

Tags

NGSS.MS-PS4-2

Diamond has a hardness of ___ on Mohs Hardness Scale.

• 1

• 5

• 8

• 10

How do you test the hardness of a mineral? 

• Throw it against a wall

• Step on it

• Scratch Test

• Kick it until it breaks

What mineral is used for pencils?

• Graphite

• Galena

• Magnetite

• Quartz

Which type of rock forms from extreme heat and pressure?

• Igneous

• Sedimentary

• Organic

• Metamorphic