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Rocks: Igneous, Metamorphic and Sedimentary


Rocks hold the history of the earth and the materials that will be used to build its future.

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

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

Sedimentary
conglomerate
Sedimentary Rocks: Photos and facts about clastic, chemical and organic sedimentary rocks.

Fossils
fossil
Fossils are remains, traces or imprints of ancient life. They reveal Earth's biological history.
Gifts That Rock
Gifts That Rock
Gifts That Rock - What are the most popular gift items in the Geology.com store?
Geodes
Geodes
Geodes look like ordinary rocks on the outside but can be spectacular inside!
Flint, Chert, Jasper
Flint, Chert, Jasper
Flint, Chert, and Jasper are types of chalcedony and names for microcrystalline quartz.
Rock and Mineral Kits
Rock and Mineral Kits
Rock, Mineral and Fossil Collections. Specimens for personal or classroom use.
Fluorescent Minerals
Fluorescent Minerals
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Tumbled Stones
Tumbled Stones
Tumbled Stones are rocks that have been rounded, smoothed and polished in a rock tumbler.
Lapis Lazuli
lapis lazuli
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Quartzite
Quartzite
Quartzite a nonfoliated metamorphic rock composed almost entirely of quartz.
Rock Tumbling
rock tumblers
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
The Brewery Rock ?
diatomite
The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.
Difficult Rocks
Difficult rocks to identify
Difficult Rocks Elementary students find lots of rocks that you will not be able to identify.
Puddingstone
Puddingstone
Puddingstone - a conglomerate with clasts that contrast in color with the matrix. Alamy Images.
Trap Rock
trap rock
Trap Rock is a name applied to any dark-colored igneous rock used to produce crushed stone.
Sand Photo Collection
Sand
Sand from Around the World . A photo gallery showing the diversity of the material we call "sand".
Rock Salt
Rock Salt
Rock Salt is a sedimentary rock composed of the mineral halite. It has many uses!
Hardness Picks
Hardness Picks
Hardness Picks - Test for hardness with precise and easy-to-use hardness picks.
Sand Grains
Sand grains
A Grain of Sand Gallery of sand grains through a microscope by Dr. Gary Greenberg.
Sliding Rocks

Sliding Rocks on Racetrack Playa How they slide across a dry lake bed is a mystery.
Charoitite
Charoitite
Charoitite - a purple metamorphic rock dominated by the mineral charoite. It is used as a gem.
Geology Dictionary
Geology Dictionary
Geology Dictionary - contains thousands of geological terms with their definitions.
Curling Stones
curling stone
Curling Stones are made from a special type of granite, found at just a few locations worldwide.
Shale
Shale
Shale The rock that is quickly transforming the energy industry.
Uses of Granite
Uses of granite
Uses of Granite The rock used everywhere from the kitchen to the facing stone of skyscrapers.
Mariposite
Mariposite
Mariposite - a name used for green chromium-rich micas and certain rocks colored by them.
Don*t Go To Jail
Don't Go To Jail
Rock Collectors must know the rules before removing rocks from public and private property.
Igneous and Volcanic
igneous and volcanic features
Igneous and Volcanic Features an introduction to how these rocks occur below and above ground.
Soapstone
Soapstone
Soapstone is a talc-rich rock with properties that make it suitable for a variety of projects.
Coquina
Coquina
Coquina - A porous limestone composed almost entirely of fossil debris.
Crushed Stone
crushed stone
The Unsung Mineral Hero - and the commodity upon which almost everything is built.
Siltstone
Siltstone
Siltstone is a sedimentary rock composed mainly of silt-sized particles.
Rock Art
Rock art - petroglyphs
Rock Art People have been producing rock art for thousands of years. A world-wide collection.
Antarctic Meteorites
hunting meteorites in Antarctica
The Richest Meteorite Field - More meteorites found here than anywhere else on Earth.
Caliche
Caliche
Caliche is a lithified layer in soil or sediment. It is considered to be a sedimentary rock.
Oil Sands
Oil Sands
Oil Sands contain oil in the form of bitumen - a major oil resource that can be difficult to produce.
Gold Panning Kits
Gold Pans
Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for gold!
Dacite
Dacite
Dacite - a light-colored extrusive igneous rock intermediate between rhyolite and andesite.
Unakite
Unakite
Unakite is a metamorphosed granite composed of green epidote and pink orthoclase.
Pictographs
pictograph
What Are Pictographs? They are drawings or paintings on rocks made by people.
Forensic Geology
Forensic Geology
Forensic Geology My students come to class thinking that dirt is dirt and sand is sand...
Rocks on Mars
Rocks on Mars
Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.
Tucson Show
Mineral Show Photos
Mineral Show Photos From the 2010 Tucson Gem, Mineral & Fossil Show.
Limestone
Limestone
Limestone A versatile rock used in cement, food, paint, paper, drugs, concrete & more!
Diabase
diabase
Diabase - the rock selected for Stonehenge and transported 240 miles in 2100 BC.
Hand Lens
Hand Lens
Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Rock-Forming Minerals
Rock-Forming Minerals
Rock-Forming Minerals - most of Earth*s crust is made up of a small number of minerals.
Chalk
chalk
Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.
Geology Tools
Geology Tools
Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Coal Close Up
Coal Through a Microscope
Coal Through a Microscope Coal is more than a black rock. It\'s THE most interesting rock.
Azurite Granite ?
Azurite Granite?
Azurite Granite? Found at the base of K2, the second highest mountain in the world.
Rockfall
Yosemite rockfall
Spectacular Yosemite Rockfall A photo sequence of rockfall and debris avalanche by Herb Dunn.