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Color• When you look at the mineral, what color is it?
Streak• When the mineral is rubbed on a streak plate, what color is the streak?
Luster• Describes how light is reflected off of this mineral Metallic Nonmetallic• Two Types – Metallic – shiny like metal … earthy waxy – Nonmetallic – not like metal pearly dull – (earthy, waxy, pearly, dull, …) [[Read about Luster at the bottom of page 47]]
Density Mass VolumeIf a mineral has a mass of 100 gramsand a volume of 50 mL, what is itsdensity?
Hardness• Moh’s hardness scale – This scale lists 10 common minerals from softest to hardest (ranking from 1-10)• Scratch Test – Use nails, pennies, paperclips and other items to test the hardness of a mineral [[Read about Hardness on p.48-49]]
Cleavage and Fracture• This describes how a mineral breaks• Some minerals break in a pattern, this is called cleavage (can be in 1, 2, or 3 different directions)• Some minerals fracture which means they break along irregular or jagged lines Read about Cleavage and Fracture on p. 50-51