Diorite: Igneous Rock - Pictures, Definition & More
Diorite is an intrusive igneous rock of intermediate composition.
Rocks: Pictures of Igneous, Metamorphic and Sedimentary Rocks
Photographs and information for a large collection of igneous, metamorphic and sedimentary rocks. Geology.com
Mineral Properties, Photos, Uses and Descriptions
Photos and information about 80 common rock-forming, ore and gemstone minerals from around the world.
Diamond: The gemstone, the mineral, the super material.
Diamond is much more than the world’s most popular gemstone and hardest natural material. Today man-made diamonds are being used in computers, speakers, cutting tools, bearings, laser windows, wear-resistant parts and much more.
Articles and Information
General geology articles, maps, facts and information from Geology.com
Gemstones: Facts, photos, and information for over 100 gems.
Articles about gemstones written by a GIA Graduate Gemologist. Each article includes photos and information about the gem's phyiscal properties and geologic origin.
Earth Science World Records | Highest, Lowest, Deepest & More
The highest mountain, deepest lake, lowest below sea level, largest earthquake and lots more.
Tumbled Stones: What are tumbled stones? How are they made?
Tumbled stones are pieces of rocks and minerals that have been rounded, smoothed and polished into beautiful gemstones in a rock tumbler.
Fluorescent Minerals and Rocks: They Glow under UV Light!
A small number of minerals and rocks will glow with spectacular colors under ultraviolet light. Learn how this happens.
Quartzite: Metamorphic Rock - Pictures, Definition & More
Quartzite is a nonfoliated metamorphic rock composed almost entirely of quartz. It usually forms from the metamorphism of sandstone.
Geodes: The rocks with a crystal surprise inside!
Geodes are spherical rock structures with an internal cavity that is often lined with quartz crystals and banded agate. Some are lined with more mundane or spectacular materials.
Rock, Mineral & Fossil Kits and Collections
We offer a variety of different size mineral, fossil and rock kits for school or personal study.
Rock Kit | Rock Collection | Rock Collecting
We offer a variety of rock kits and rock collections for classroom and personal use
Pegmatite: Igneous Rock - Pictures, Definition & More
Pegmatite is an intrusive igneous rock with very large crystals that forms in the later stages of a magma chamber's crystallization.
Geology Tools, Supplies, Equipment and Books
Visit the Geology.com Store for a large selection of geology equipment, tools, books and supplies.
Andesite: Igneous Rock - Pictures, Definition & More
Andesite is an extrusive igneous rock named after the Andes Mountains where it is very abundant.