geology Free rock tumbling guide

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 Most Popular
racetrack playa
Sliding Rocks - Racetrack Playa How these rocks slide across a dry lake bed is a mystery. Photo © iStockphoto / Stephan Hoerold rock tumblers
Free Guide to Rock Tumbling:
Step-by-step guide to tumble polishing rocks into gemstones. yosemite rockfall
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 Petroglyphs and Pictographs A world-wide collection of rock art. © iStockphoto / Kevin Lange. mineral rights
Mineral Rights / Surface Rights
Who owns the minerals under your land? Have they been sold? Opal photo gallery
Opal Pictues and Descriptions: A colorful photo gallery showing different types of opal. Sand grains through a microscope
"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
diorite
Igneous Rocks: Photos and facts about intrusive and extrusive igneous rocks.
Andesite
Andesite		   Basalt
Basalt

Quartz Diorite
Diorite		   Gabbro
Gabbro

Granite
Granite		   Obsidian
Obsidian

Pegmatite
Pegmatite		   Peridotite
Peridotite

Pumice
Pumice		   Rhyolite
Rhyolite

Scoria
Scoria		   Welded Tuff
Tuff
granite 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
gneiss
Metamorphic Rocks: Photos and facts about foliated and non-foliated metamorphic rocks.
Amphibolite
Amphibolite		   Gneiss
Gneiss

Hornfels
Hornfels		   Marble
Marble

Phyllite
Phyllite		   Quartzite
Quartzite

Muscovite Schist
Schist		   Slate
Slate


 Geology News
The Science of July 4th Fireworks!:  The shapes and colors that you see in...

World Topographic Map:  NASA and Japan released a new digital topographic...

Lightning and Dust Storms on Mars:  This article from the University of Michigan discusses...

Subsidence in the Mississippi Delta:  It is predicted that the Mississippi River Delta...

Purple Sunsets from Sarychev Eruption:  The particles ejected from the Sarychev Peak eruption...

Mapping Sinkholes Near the Dead Sea:  Several years ago, geologist Eli Raz fell into...

LA Turns to Renewable Energy Sources:  Los Angeles is turning its attention to renewable...

Coal Ash: Hazardous Dumping Sites:  The EPA has created a list of over...

Why Is the Rig Count Rising?:  A blog post on the Wall Street Journal...

A Quote From Charles Darwin:  Geologists constantly deal with fragmentary data. It's what...

The present is the key to the past.
  
 Sedimentary
conglomerate
Sedimentary Rocks: Photos and facts about clastic, chemical and organic sedimentary rocks.
Breccia
Breccia		   Chert
Chert

Anthracite Coal
Coal		   Conglomerate
Conglomerate

Hematite Iron Ore
Iron Ore		   Limestone
Limestone

Halite Rock Salt
Rock Salt		   Sandstone
Sandstone

Shale
Shale		   Siltstone
Siltstone
coal through a microscope
Coal Through a Microscope: Coal is more than a black rock. It's THE most interesting rock.
Marcellus Shale
Marcellus Shale: The most overlooked resource in the eastern United States!
Great Bahama Bank
Great Bahama Bank: A spectacular satellite image of the Bank, islands and surrounding ocean - a classic carbonate environment.
Geology underlies it all.
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