Rocks: Pictures of Igneous, Metamorphic and Sedimentary Rocks
Metamorphic Rocks: Photos, descriptions and facts about foliated and non-foliated metamorphic rocks.
Sedimentary Rocks | Pictures, Characteristics, Textures, Types
Organic sedimentary rocks form from the accumulation of plant or animal debris. Examples include: chalk, coal, diatomite, some dolomites, and some limestones. Photos and brief descriptions of some common sedimentary rock types are shown on this page.
Igneous Rocks | Pictures of Intrusive and Extrusive Rock Types
Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass. These rocks include: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff. Pictures and brief descriptions of some common igneous rock types are shown on this page.
Metamorphic Rocks | Pictures of Foliated and Non-Foliated Types
Metamorphic rocks have been modified by heat, pressure, and chemical processes, usually while buried deep below Earth's surface. Exposure to these extreme conditions has altered the mineralogy, texture, and chemical composition of the rocks.
Meteorite Identification: Have you found a space rock?
Identification of a genuine meteorite takes a practiced eye, but there are a number of simple tests that can help hopeful rock hounds determine if they have stumbled across a rare space rock, or just a common earthbound stone.
Iron Ore: Sedimentary Rock - Pictures, Definition & More
Rocks: Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
The Most Difficult Rocks to Identify | Teaching Rock Identification
Rocks: Galleries of igneous, sedimentary and metamorphic rock photos with descriptions. Minerals: Information about ore minerals, gem materials and rock-forming minerals. Volcanoes: Articles about volcanoes, volcanic hazards and eruptions past and present.
Verdite and Buddstone: Green rocks containing fuchsite
Verdite and Buddstone are trade names used for green rocks colored by abundant inclusions of fuchsite, a chromium-rich variety of muscovite mica. Quality specimens are used as an architectural stone, small sculptures, or cut for use in jewelry.
Stone Meteorites: Their Origin, Classification, Pictures - Geology.com
Rocks: Galleries of igneous, sedimentary and metamorphic rock photos with descriptions. Minerals: Information about ore minerals, gem materials and rock-forming minerals. Volcanoes: Articles about volcanoes, volcanic hazards and eruptions past and present.
Gemstones: Facts, photos, and information for over 100 gems.
Articles about gemstones written by a GIA Graduate Gemologist. Each article includes photos and information about the gem's physical properties and geologic origin.