TEST - Minerals

What is the primary characteristic that defines a mineral?

• It is always organic
• It has a specific chemical composition and crystalline structure
• It is always formed from magma
• It is always soft and pliable

Which of the following is NOT a characteristic of minerals?

• Naturally occurring
• Inorganic
• Solid
• Always formed from living organisms

How does the rate of magma cooling affect mineral crystal size?

• Rapid cooling forms large crystals
• Slow cooling forms small crystals
• Rapid cooling forms small crystals
• Cooling rate has no effect on crystal size

Which of the following is NOT a property used to identify minerals?

• Luster
• Hardness
• Weight
• Streak

What does the term 'luster' refer to in mineral identification?

• The color of the mineral
• The way a mineral reflects light from its surface
• The hardness of the mineral
• The crystal structure of the mineral

What scale is commonly used to measure a mineral's hardness?

• Richter scale
• pH scale
• Mohs scale
• Celsius scale

What is cleavage in minerals?

• The way a mineral breaks along weak planes
• The color of a mineral's powder
• The mineral's ability to scratch glass
• The mineral's reaction to acid

What is the streak of a mineral?

• Its crystal shape
• Its color when powdered
• Its hardness
• Its density

What is the primary difference between cleavage and fracture in minerals?

• Cleavage occurs in metallic minerals, fracture in non-metallic
• Cleavage results in smooth planes, fracture in irregular surfaces
• Cleavage is a chemical property, fracture is physical
• Cleavage only occurs in soft minerals, fracture in hard minerals

Which of the following is true about the formation of mineral crystals?

• They only form in igneous rocks
• They require biological processes
• They form in repeating geometric patterns
• They always form large, visible structures