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Sandstone

What is Sandstone?

Sandstone is a clastic sedimentary rock made up mainly of sand-size (1/16 to 2 millimeter diameter) weathering debris. Environments where large amounts of sand can accumulate include beaches, deserts, flood plains and deltas.

sandstone

Sandstone: The specimen shown is about two inches (five centimeters) across.

The rock photos above were taken by Ann Bryant and are copyright by Geology.com.

Sedimentary Rocks

Breccia

Chert

Chert

Anthracite Coal

Coal

Conglomerate

Conglomerate

Hematite Iron Ore

Limestone

Halite Rock Salt

Sandstone

Shale

Shale

Siltstone

A Guide to Rock Tumbling

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

Sedimentary Rocks

Sedimentary Rock Photo Gallery: A collection of sedimentary rock pictures and short descriptions.

Teaching plate tectonics

Teaching Plate Tectonics: Ideas for teaching plate tectonics with easy-to-draw illustrations.

coal through a microscope

Coal Through a Microscope: Coal is more than a black rock. It's THE most interesting rock.

Racetrack Playa

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

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.

gneiss

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

Quartz Diorite

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

Rock tumbler

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