Determining Mineral Hardness

Mr. Baldin introduces students Jasmine and Adna to the concept of mineral hardness, following a recap on luster. The lesson explains the Mohs hardness scale, ranging from 1 to 10, with examples like fingernails and diamonds. Students conduct hands-on tests using fingernails, pennies, and nails to determine mineral hardness. The lesson progresses to advanced testing with minerals like corundum and topaz, emphasizing practical understanding. The session concludes with a farewell.

What is the primary focus of the lesson after discussing lusters?

• Color

• Hardness

• Shape

• Size

What does hardness measure in minerals?

• Resistance to heat

• Resistance to abrasion or scratching

• Resistance to water

• Resistance to light

On the Mohs hardness scale, what is the hardness of a fingernail?

• 5.0

• 7.5

• 1.0

• 2.5

Which mineral is the hardest on the Mohs hardness scale?

• Quartz

• Topaz

• Diamond

• Corundum

What is the hardness of gypsum on the Mohs scale?

• 4

• 3

• 2

• 1

Tags

NGSS.MS-PS1-1

If a mineral can scratch a penny but not a wire nail, what is its approximate hardness?

• 5.5

• 4.0

• 3.5

• 2.0

What is the hardness of a streak plate on the Mohs scale?

• 4.5

• 5.5

• 6.5

• 7.5

Which mineral is commonly found in toothpaste and water?

• Fluorite

• Gypsum

• Quartz

• Topaz

What mineral is corundum commonly found in?

• Emeralds

• Rubies

• Opals

• Sapphires

If a mineral can scratch a metal file, what is its hardness likely to be?

• Less than 5.0

• Between 5.0 and 6.0

• Greater than 7.0

• Between 6.0 and 7.0