The Mohs Scale

Front

What is the Mohs Scale?

Back

The Mohs Scale is a scale that ranks minerals based on their hardness, from 1 (softest) to 10 (hardest).

Front

What mineral is ranked as the softest on the Mohs Scale?

Back

Talc is ranked as the softest mineral on the Mohs Scale, with a hardness of 1.

Front

What mineral can be scratched by a fingernail?

Back

Gypsum can be scratched by a fingernail, which has a hardness of about 2.5.

Front

What is the hardest mineral on the Mohs Scale?

Back

Diamond is the hardest mineral on the Mohs Scale, ranked at 10.

Front

True or False: Diamond is the hardest mineral on the Mohs Scale.

Back

True.

Front

What mineral can a masonry drill bit scratch?

Back

A masonry drill bit can scratch Topaz, which has a hardness of 8.

Front

What is the hardness of Quartz on the Mohs Scale?

Back

Quartz has a hardness of 7 on the Mohs Scale.

Front

What mineral is ranked just below Diamond on the Mohs Scale?

Back

Corundum, which includes sapphires and rubies, is ranked just below Diamond at 9.

Front

What is the significance of Friedrich Mohs in geology?

Back

Friedrich Mohs developed the Mohs Scale of mineral hardness in 1812, which is still used today.

Front

What is the hardness of Fluorite on the Mohs Scale?

Back

Fluorite has a hardness of 4 on the Mohs Scale.