What's a hardness scale?
Some minerals are very hard, others are very soft. We can use the Mohs Hardness
Scale to compare the hardness of any mineral. The higher the number on the
scale, the harder the mineral is. Each mineral can scratch only those minerals
below it on the scale.
Don't see the Mohs Scale? Click
here.
Learn more in Rex the Dino Detective's "Mystery of the Golden Cube"
© The Children's Museum of Indianapolis, 2000