Mineral Identification and Properties

Mr. Klein discusses mineral identification, emphasizing the need for multiple tests due to color variations and impurities. Key tests include luster, streak, hardness (Mohs scale), cleavage, fracture, density, texture, magnetism, and fluorescence. The lesson aims to equip students with the ability to identify minerals using these properties.

Why is it important to use more than one property to identify minerals?

• Because minerals can change properties over time.

• Because a single property can be misleading due to similarities in appearance.

• Because it is faster to use multiple properties.

• Because it is a requirement in geology.

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

• The color of a mineral in its natural state.

• The way a mineral reflects or absorbs light.

• The density of a mineral.

• The magnetic properties of a mineral.

How is the streak of a mineral tested?

• By scratching it with a diamond.

• By observing its color in sunlight.

• By rubbing it across an unglazed porcelain plate.

• By weighing it in water.

What is the Mohs hardness scale used for?

• To evaluate the magnetic properties of minerals.

• To assess the resistance of minerals to being scratched.

• To determine the weight of minerals.

• To measure the color of minerals.

Which mineral is the hardest according to the Mohs scale?

• Diamond

• Talc

• Gypsum

• Quartz

What is cleavage in the context of mineral properties?

• The color change in minerals.

• The smooth, flat surfaces along which a mineral breaks.

• The density of a mineral.

• The magnetic attraction of a mineral.

How does fracture differ from cleavage?

• Fracture occurs in all minerals, while cleavage is rare.

• Fracture is a measure of hardness, while cleavage is not.

• Fracture results in smooth surfaces, while cleavage does not.

• Fracture results in uneven surfaces, while cleavage results in smooth, flat surfaces.

What property is being tested when a mineral is weighed and its volume is measured?

• Density

• Streak

• Hardness

• Luster

Which mineral property involves the ability to glow under ultraviolet light?

• Streak

• Cleavage

• Fluorescence

• Magnetism

What is a common use for graphite due to its texture?

• As a gemstone

• As a lubricant

• As a building material

• As a food additive