Minerals

There are six types of asbestos fibres. These are chrysotile, amosite, crocidolite, tremolite, actinolite and anthophyllite. Asbestos is a naturally occurring mineral.

Nov 27, 2009 - Sharon Kirby

Minerals are natural crystalline substances with distinct chemical compositions. Knowledge of minerals is the foundation of geology, the study of rocks and of the Earth.

Nov 13, 2009 - Molly Markey

Treasured for centuries as symbols of extreme wealth and power, diamonds are made of pure carbon and come from deep within the earth's crust.

Oct 31, 2009 - Scott Hayden

Stunning vistas, fascinating geological features and a large selection of obsidian makes Glass Buttes a stimulating environment.

Sep 16, 2009 - David Katski

Minerals evolved along with the solar system and more so on Earth due to the presence of life, which helps scientists in the search for extraterrestrial life.

Nov 13, 2008 - Kelly Whitt

Sedimentary rock formations are those which are formed by layer upon layer of sediment being laid down by natural forces. It is the stone in which history is hidden.

Mar 25, 2008 - Isaac M. McPhee

Metamorphic rocks are those which change type over time and under certain conditions. They are proof that rock may not be as stable and permanent as it seems.

Mar 24, 2008 - Isaac M. McPhee

Igneous rocks are formed from lava (or magma), though they are not easily definable, as they exist in over seven hundred varieties.

Mar 24, 2008 - Isaac M. McPhee

Brilliant cut diamonds are always a treat. Understanding the natural processes behind diamond formation makes these precious gemstones even more wonderful to behold.

Sep 14, 2007 - Lisa A. Bessasparis

Inside the most pedestrian rocks, miniature cathedrals may be awaiting discovery. Geodes conceal crystal palaces hidden for millenia; you need only know where to look.

May 4, 2007 - Juliette Riitters