Mineral Properties and Lab Practical Insights

The video tutorial discusses the differences between mineral cleavage and fracture, emphasizing the importance of observing flat sides and angles for cleavage and random breakage for fracture. It provides visual examples to illustrate these concepts. Additionally, the video demonstrates a mineral hardness test using a glass plate, highlighting the tactile experience of feeling a mineral scratch or glide across the glass.

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

• Fracture has flat sides or geometric shapes, while cleavage has random or bumpy surfaces.

• Cleavage is a type of fracture.

• Cleavage is always shiny, while fracture is always dull.

• Cleavage has flat sides or geometric shapes, while fracture has random or bumpy surfaces.

Which of the following indicates a mineral has cleavage?

• Random breakage patterns

• Bumpy surfaces

• Flat sides or geometric shapes

• No flat sides or angles

What should you look for to identify cleavage in a mineral?

• Flat sides or angles

• Bumpy surfaces

• Random breakage

• Glassy look

Which of the following is a characteristic of fracture in minerals?

• Clean angles

• Geometric shapes

• Random breakage or bumpy surfaces

• Flat sides

How can light reflection help in identifying cleavage?

• Cleavage surfaces reflect light in a uniform way.

• Fracture surfaces reflect light uniformly.

• Cleavage surfaces do not reflect light.

• Fracture surfaces reflect light in a uniform way.

Tags

NGSS.MS-PS4-2

What is a common mistake students make when identifying cleavage?

• Expecting all sides to be perfect

• Looking for bumpy surfaces

• Ignoring light reflection

• Confusing it with fracture

What is the purpose of the hardness test with a glass plate?

• To measure the weight of the mineral

• To see if the mineral reflects light

• To determine if the mineral can scratch the glass

• To identify the color of the mineral

Why should you keep your eyes closed during the hardness test?

• To avoid breaking the glass

• To prevent the mineral from slipping

• To better see the scratch marks

• To focus on the feel of the mineral digging into the glass

What should you do if you can't tell if a mineral is scratching the glass?

• Try another side or edge of the mineral

• Press harder on the glass

• Look at the mineral under a microscope

• Use a different glass plate

Which mineral clearly scratches the glass in the hardness test?

• Quartz

• Gypsum

• Calcite

• Mica