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Home
» Rocks
Rocks: Igneous, Metamorphic and Sedimentary
Most Popular
Sliding Rocks - Racetrack Playa
How these rocks slide across a dry lake bed is a mystery. Photo © iStockphoto / Stephan Hoerold
Coal Through a Microscope
: Coal is more than a black rock. It's THE most interesting rock.
Rock Tumblers:
Step-by-step guide to tumble-polishing rocks into gemstones.
Uses of Granite:
The rock used everywhere from the kitchen to the facing stone of skyscrapers.
Opal Pictues and Descriptions:
A colorful photo gallery showing different types of opal.
"A Grain of Sand"
: A gallery of sand grains photographed through a microscope by Dr. Gary Greenberg.
Forensic Geology:
"My students come to class thinking that dirt is dirt and sand is sand...".
NASA at Racetrack Playa:
Visit Racetrack Playa to solve the mystery of the sliding rocks.
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.
Igneous
Igneous Rocks
: Photos and facts about intrusive and extrusive igneous rocks.
Andesite
Basalt
Diorite
Gabbro
Granite
Obsidian
Pegmatite
Peridotite
Pumice
Rhyolite
Scoria
Tuff
Petroglyphs
and
Pictographs
A world-wide collection of rock art. © iStockphoto / Kevin Lange.
Carbonatite Lava Flows at Oldoinyo Lengai:
These CO2-rich lavas flow like motor oil.
Tell Zeidan:
Excavation in Syria reveals an obsidian trade and copper metallurgy at 4000 BC.
Difficult Rocks:
Elementary students find lots of rocks that you will not be able to identify.
Obsidian Secrets:
Rock characteristics reveal Native American travel routes.
Mineral Show Photos:
From the 2010 Tucson Gem, Mineral & Fossil Show.
Metamorphic
Metamorphic Rocks
: Photos and facts about foliated and non-foliated metamorphic rocks.
Amphibolite
Gneiss
Hornfels
Marble
Novaculite
Phyllite
Quartzite
Schist
Slate
Soapstone
Novaculite
: Famous for making stone tools, weapons and sharpening stones.
Soapstone
is a talc-rich rock with properties that make it suitable for a variety of projects.
Rock Kits
Rock Kits:
Get a collection of sedimentary, metamorphic and igneous rocks.
Where Rocks are Made of Ice:
Rocks on Saturn's moon Titan are likely made of water ice.
Mars Mystery Rock:
What are these coatings on rocks at a young crater?
Sedimentary
Sedimentary Rocks
: Photos and facts about clastic, chemical and organic sedimentary rocks.
Breccia
Chert
Coal
Conglomerate
flint
Iron Ore
Limestone
Oil Shale
Rock Salt
Sandstone
Shale
Siltstone
Flint
is a rock that has been made into tools and weapons for over two million years.
Shale:
The rock that is quickly transforming the energy industry by yielding natural gas.
Oil Sands
contain oil in the form of bitumen. A major oil resource that can be difficult to produce.
Limestone:
A versatile rock used in cement, food, paint, paper, drugs, concrete & more!
Banded Iron Formations:
A new model is proposed for the origin of BIFs.
Marcellus Shale
: The most overlooked resource in the eastern United States!
Great Bahama Bank:
A spectacular image of the Bank, islands and surrounding ocean.
