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  • The Rock Identification Key - by Don Peck

    What is the Rock Cycle? Rocks, like mountains, do not last forever. The weather, running water, and ice wear them down. All kinds of rocks become sediment.

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  • List of rock types - Wikipedia

    Argillite - a sedimentary rock composed primarily of clay-sized particles Arkose - a sandstone with <25% feldspar crystals Banded iron formation - a fine-grained chemical sedimentary rock composed of iron oxide minerals

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  • Sedimentary rock | Britannica.com

    Sedimentary rock: Sedimentary rock, rock formed at or near the Earth's surface by the accumulation and lithification of sediment (detrital rock) or by the precipitation from solution at normal surface temperatures (chemical rock).

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  • The Quartz Page: Occurrence

    Rocks are sometimes cut by quartz veins at random orientations, with or without crystals. In other cases there is an obvious pattern in the orientations of the veins: for example, when a igneous rock shrinks during cooling, the cracks may develop into a regular system of fissures that might be filled with quartz from percolating hot brines.

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  • Quartz | Define Quartz at Dictionary.com

    Quartz definition, one of the commonest minerals, silicon dioxide, SiO2, having many varieties that differ in color, luster, etc., and occurring either in masses (as agate, bloodstone, chalcedony, jasper, etc.) or in crystals (as rock crystal, amethyst, citrine, etc.): the chief constituent of sand and sandstone, and an important constituent of ...

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  • Colorado Rocks - Domain Index for

    Colorado Geology Photojournals A Tribute to Colorado's Physical Past and Present Right: Trees and snow mark major Laramide uplifts in green and white while salmon pink marks the Colorado Plateau in this true-color satellite image of Colorado and surrounding states, courtesy NASA, ^Visible Earth

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  • List of rock types - Simple English Wikipedia, the free ...

    List. Sorted by name; initial letter means Igneous, Sedimentary or Metamorphic rocks.. A I Andesite – an intermediate volcanic rock M Anthracite – a form of hard coal B S Banded iron formation – a fine grained chemical sedimentary rock composed of iron oxide minerals

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  • Sedimentary rock - Wikipedia

    Clastic sedimentary rocks are composed of other rock fragments that were cemented by silicate minerals. Clastic rocks are composed largely of quartz, feldspar, rock (lithic) fragments, clay minerals, and mica; any type of mineral may be present, but they in general represent the minerals that exist locally.

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  • Sandstone: Sedimentary Rock - Pictures, Definition & More

    Sandstone is a clastic sedimentary rock composed of sand-sized grains of mineral, rock or organic material.

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  • Sedimentary rock - Classification of sandstones | Britannica.com

    Sedimentary rock - Classification of sandstones: There are many different systems of classifying sandstones, but the most commonly used schemes incorporate both texture (the presence and amount of either interstitial matrix—i.e., clasts with diameters finer than 0.03 millimetre—or chemical cement) and mineralogy (the relative amount of ...

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  • 10(f) Characteristics of Sedimentary Rocks

    Figure 10f-3: Dipping sedimentary layers of rock, Rocky Mountains, Canada.. The classification of clastic sedimentary rocks is based on the particle types found in the rock.

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  • Conglomerate: Sedimentary Rock - Pictures, Definition & More

    What is Conglomerate? Conglomerate is a clastic sedimentary rock that contains large (greater than two millimeters in diameter) rounded clasts. The space between the clasts is generally filled with smaller particles and/or a calcite or quartz cement that binds the rock together.

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  • How to Write a Rock Description for Igneous, Sedimentary and ...

    I have split igneous, sedimentary and metamorphic rock descriptions into separate posts to make it simpler to read. I will add links to the others as I write them:

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  • The Quartz Page: Quartz as a Rock-Forming Mineral

    For example, a rock that is entirely made of albite, NaAlSi 3 O 8, a feldspar, has 0% quartz content, but contains 77.3% silica (weight percent).. It was once customary to express the chemical composition of a mineral as an oxide formula (mostly because the structural relationships between the elements involved were not precisely known), and it ...

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  • Minerals, Rocks & Rock Forming Processes

    Rock bodies that cool beneath the surface are generally described as Plutons.A batholith is a large former magma chamber, often many miles across. A sill is a sheetlike injection of magma between layers of sedimentary rock.

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  • Rocks & Minerals Definitions - Rock, Mineral and Fossil ...

    Obsidian Obsidian is volcanic glass. Oligoclase Oligoclase has the formulae (Na,Ca)AlSi3O8 and a relative hardness of 7. It is a plagioclase feldspar.Of interest to petrologists and collectors.

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