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Date: ____________
Rocks and Minerals
Minerals
A mineral is like a pure chocolate bar. It is made up of the same substance all the
way through. They are solids. A mineral is made up of crystals. Almost all
minerals have straight edges and flat surfaces. Minerals have different colours,
hardness and crystal forms. There are about 2000 types of minerals.
Rocks
A rock is like a chocolate bar with all of the “good stuff” (marshmallows, wafers,
nuts, etc). They are made up of two or more minerals. The composition (what
the rock is made of) varies. You may observe flecks and grains of different sizes
and colours. There are only three types of rocks.
Compare each of the following items to a rock or a mineral.
Object
Granola Bar
Fruit Roll-Up
Wood
Tree
Person
Mineral
Rock