Chapter 4

Valuable minerals that are prized for their rarity and beauty. They are very hard and scratch resistant.

A mineral that someone can make money from mining and selling.

A group of minerals composed of sulfur and one more additional elements; pyrite .(iron and two sulfur elements)

A group of minerals composed of oxygen and a metal. For example, hematite (2 irons and 3 oxygen) and magnetite (3 irons and four oxygen)

A group of minerals made of carbon, oxygen and a metallic element. They are found in marble and limestone, in addition to other materials

Shape created by four equilateral triangles

Group of minerals composed of oxygen, silicon and often additional elements. The oxygen and silicon form tetrahedrons. Largest group of minerals - 96%.