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Free Guide to Rock Tumbling: Step-by-step guide to tumble polishing rocks into gemstones. Also, How to Select a Tumbler.

Sliding Rocks - Racetrack Playa How these rocks slide across a dry lake bed is a mystery. Photo © iStockphoto / Stephan Hoerold

Spectacular Yosemite Rockfall: A photo sequence of rockfall and debris avalanche by Herb Dunn.

Wall Arch in Arches National Park Collapsed

Wall Arch Collapses: Wall Arch, a popular feature at Arches National Park Collapsed in the night on August 4, 2008.

Petroglyphs and Pictographs A world-wide collection of rock art. © iStockphoto / Kevin Lange.

Mineral Rights / Surface Rights Who owns the minerals under your land? Have they been sold?

Opal Pictues and Descriptions: A colorful photo gallery showing different types of opal.

"A Grain of Sand": A gallery of sand grains from around the world as photographed through a microscope by Dr. Gary Greenberg.

If it is not grown, it is mined.

Igneous

Igneous Rocks: Photos and facts about intrusive and extrusive igneous rocks.

Andesite

Basalt

Diorite

Gabbro

Granite

Obsidian

Pegmatite

Peridotite

Pumice

Rhyolite

Scoria

Tuff

Uses of Granite: The rock used everywhere from the kitchen to the facing stone of skyscrapers.

Carbonatite lava flows at Oldoinyo Lengai

Carbonatite Lava Flows: Some of the most fluid lavas in the world!

Oil is found first in the mind.

Metamorphic

Metamorphic Rocks: Photos and facts about foliated and non-foliated metamorphic rocks.

Amphibolite

Gneiss

Hornfels

Marble

Phyllite

Quartzite

Schist

Slate

Geology News

Moa Fossils and New Zealand Geology: The moa is a large, extinct bird that...

Technology for Fossil Identification: Assembling fossils from countless tiny pieces can be...

American Chemical Society Top 10: The American Chemical Society singles out ten technologies...

How Do Glass-Like Skeletons Develop in Diatoms?: Diatoms secrete a glass-like extracellular skeleton and are...

SUNRISE Telescope: Great Solar Images: The SUNRISE telescope was sent into the stratosphere...

Large Hadron Collider Readied: The Large Hadron Collider (LHC) is almost ready...

Climate Spurs Bristlecone Pine Growth: Higher temperatures in recent decades have encouraged the...

Biodegradable Plastic from Corn: Biodegradable plastic made from corn has been around...

Worms Launched into Space: Space station supplies weren't the only thing on...

Video: Encounter With A Giant Leopard Seal: Here is a video in which Paul Nicklen,...