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Rocks: Igneous, Metamorphic and Sedimentary

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Rock Tumblers: Step-by-step guide to tumble-polishing rocks into gemstones. And an article: 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.

Rock Tumbler Instructions: A set of step-by-step tumbling instructions.

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

New Ideas on Subsurface Water Movement: Researchers at Oregon State University have made some...

Natural Gas: Transforming Our Energy Future: In an article on the Journal of American...

Infrared Reveals Near-Earth Objects: Near-Earth objects are now being identified through infrared...

Natural Gas Prices By State: The prices paid and received for natural gas...

Arctic Sea Ice Animation: Earth Observatory has an animation of Arctic sea...

Alabama Gas Shale Research: "To assist in the development of emerging gas...

Primate Brain and Body Size Evolution: As man evolved, his brain size increased. However,...

Cameras Detect Nuclear Contamination: A gamma-ray camera used in hospitals can also...

The Disappearing Water of Napa Valley: The water used to irrigate the vineyards in...

Final Demolition of Centralia: Centralia, Pennsylvania is the site of an underground...