Which of these describes cleavage in minerals?

• the tendency to split along specific planes, forming flat surfaces

• the tendency to break unevenly with surfaces that are irregular

• the tendency to split jaggedly, forming irregular surfaces

• the tendency to break suddenly and without warning

This is the scale used by geologist to determine a mineral's hardness.

• Moh's Hardness Scale

• Mendeleev's Scale

• Streak and Hardness Scale

• Mineral Hardness Scale

Which mineral is the hardest?

• diamond

• fluorite

• gypsum

• talc

Which of these is usually a quality of a mineral that is a natural solid?

• inorganic, with uncharacteristic physical properties

• • 
    

    organic, with characteristic physical properties

• inorganic, with characteristic physical properties

• organic, with uncharacteristic physical properties

Which of these lists only minerals?

• • 
    

    obsidian, gypsum, corundum

• quartz, coal, granite

• pyrite, halite, brass

• fluorite, feldspar, copper

What two minerals in the greatest abundance in Earth's crust?

• Iron and Magnesium

• Sodium and Potassium

• Oxygen and Silicon

• Aluminum and Calcium

What is the term for how light is reflected from a mineral’s surface?

• radioactivity

• streak

• refractions

• luster

Which of these is the term for the color of a mineral in powdered form?

• cleavage

• fracture

• streak

• luster

What are metals, such as gold and silver, that can exist in Earth’s crust as nuggets of pure metal called?

• compounds

• native elements

• placer deposits

• ore