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Gneiss



What is Gneiss?

Gneiss is foliated metamorphic rock that has a banded appearance and is made up of granular mineral grains. It typically contains abundant quartz or feldspar minerals.

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


Igneous Rocks
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Petroglyphs and Pictographs
Rocks and Minerals


The rock photos above were taken by Ann Bryant and are copyright by Geology.com.
 
Metamorphic Rocks
Amphibolite
Amphibolite		   Gneiss
Gneiss

Hornfels
Hornfels		   Marble
Marble

Phyllite
Phyllite		   Quartzite
Quartzite

Muscovite Schist
Schist		   Slate
Slate




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.

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

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

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What Are Meteorites? Learn about meteorites from 10 articles written by meteorite hunter, Geoffrey Notkin.

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The Many Uses of Gold: Learn how the unique properties of gold make it extremely suited for a large number of industrial uses.

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

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

Rock tumbler


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