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Rock and Mineral Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the rock or mineral term you are looking for is not in the dictionary, please e-mail us and we'll add it.

Moh's Scale

The Mohs Scale of Hardness measures a substance's hardness, that is, how resistant that substance is to being scratched. This scale was invented by Austrian mineralogist Friedrich Mohs (1773-1839).

In the Mohs scale, one substance is harder than another if it can scratch it. The scale ranges from 1 to 10. For example, a diamond (hardness = 10) will scratch garnet (hardness = 6.5-7.5), but not the other way around, so a diamond is harder than garnet.

Substance Hardness
Talc 1
Amber, Fingernail, Ivory, Shell, Jet 2.5
Gold 2-3
Bronze, Coral, Pearl 3
Azurite 3.5-4
Iron 4
Glass 5
Lapis lazuli 5-5.5
Turquoise 5-6
Opal 5.5-6.5
Moonstone 6-6.5
Peridot 6.5
Jade 6.5-7
Amethyst, Chalcedony, Quartz, Steel (pocket knife) 7
Garnet 6.5-7.5
Tourmaline 7-7.5
Zircon 7.5
Aquamarine, Emerald 7-8
Spinel, Topaz 8
Chrysoberyl 8.5
Ruby, Sapphire 9
Diamond 10

EnchantedLearning.com
Rock and Mineral Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the rock or mineral term you are looking for is not in the dictionary, please e-mail us and we'll add it.

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