We just learned about Pyrite.
The most common type of mineral on the earth is called feldspar.
The word feldspar comes from the German language and means "field rock that does not have ore".
Ore is something in rocks that can be used to make metal.
Over half of the earth's crust is made up of feldspar.
The crust is the outer part of the planet earth.
Feldspar is made from elements like potassium, sodium, or calcium combined with other elements like aluminum, silicon, and oxygen.
(from: wikipedia - feldspar)
Kid Facts - Blast from the past: Earth's Gravity
