Photos and information about 80 common rock-forming, ore and gemstone minerals from around the world.

There are approximately 4000 different minerals, and each of those minerals has a unique set of physical properties. These include: color, streak , hardness , luster , diaphaneity, specific …

A small number of minerals and rocks will glow with spectacular colors under ultraviolet light. Learn how this happens.

Most of Earth’s crust is comprised of a small number of minerals. These minerals are known as the common rock-forming minerals.

The photographs and descriptions on this page illustrate some of the most common lusters observed in minerals.

Minerals: Information about ore minerals, gem materials and rock-forming minerals.

Minerals: Information about ore minerals, gem materials and rock-forming minerals.

A list of minerals in order of hardness can be a handy reference. If you determine that a specimen has a hardness of Mohs 4, you can quickly get a list of potential minerals. Practice and …

Feldspar minerals occur in igneous, metamorphic and sedimentary rocks throughout the world. They are used to make glass, ceramics, paint, plastics, rubber and many other products. …

An identification and reference guide to over 350 minerals, rocks, and gems. This book is a 4 1/2" x 7 5/8" paperback with 254 pages, and there are multiple color photos on practically every …