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park in
Colorado Springs, CO, Costa Rica..A
rock is a nature occurring aggregate of minerals and/or
mineraloids. The Earth's lithosphere is made of rock. In general rocks are of three types, namely, igneous,
sedimentary, and Metamorphic rock. Petrology is the scientific study of rocks.
Rock classification
Rocks are classified by mineral and chemical composition, by the Texture (geology) of the constituent particles and by the processes that formed them. These indicators separate rocks into igneous rock, sedimentary rock and
metamorphic rock. They may also be classified according to
particle size, in the case of Conglomerate (geology)s and
breccias or in the case of individual
stones. The transformation of one rock type to another is described by the geological model called the
rock cycle.
Igneous
Igneous rocks are formed when molten magma cools and are divided into two main categories:
Intrusion and volcanic. Plutonic or intrusive rocks result when magma cools and crystallizes slowly within the Earth's crust (example granite), while volcanic or extrusive rocks result from magma reaching the surface either as lava or fragmental ejecta (examples
pumice and
basalt) .Blatt, Harvey and Robert J. Tracy, 1996,
Petrology, W. H. Freeman, 2nd ed. ISBN 0-7167-2438-3
Sedimentary
Sedimentary rocks are formed by deposition of either clastic
sediments, organic matter, or chemical precipitates (
evaporites), followed by compaction of the particulate matter and cementation during
diagenesis. Sedimentary rocks form at or near the Earth's surface. Mud rocks comprise 65% (
mudstone,
shale and siltstone);
sandstones 20 to 25% and
carbonate rocks 10 to 15% (
limestone and dolostone).
Metamorphic
Metamorphic rocks are formed by subjecting any rock type (including previously-formed metamorphic rock) to different temperature and pressure conditions than those in which the original rock was formed. These temperatures and pressures are always higher than those at the Earth's surface and must be sufficiently high so as to change the original minerals into other mineral types or else into other forms of the same minerals (e.g. by
recrystallisation).There are also Foliated and nonfoliated rock types.
Classification caveat
The three classes of rocks: the igneous, the sedimentary and the metamorphic — are subdivided into many groups. There are, however, no hard and fast boundaries between allied rocks. By increase or diminution in the proportions of their constituent minerals they pass by every gradation into one another, the distinctive structures also of one kind of rock may often be traced gradually merging into those of another. Hence the definitions adopted in establishing rock nomenclature merely correspond to selected points (more or less arbitrary) in a continuously graduated series. This is frequently urged as a reason for reducing rock classification to its simplest possible terms, and using only a few generalized rock designations. But it is clear that many apparently trivial differences tend regularly to recur, and have a real significance, and so long as any variation can be shown to be of this nature it deserves recognition.
Coloration
Iron oxides and
carbonates play a large part in many sedimentary rocks and are especially important as coloring agents. The red sands and limestones, for example, which are so abundant, contain small amounts of
iron(III) oxide (
hematite), which in a finely divided state gives a red hue to all rocks in which it ispresent. Limonite and goethite, on the other hand, makes rocks yellow or brown; manganese oxides,
asphalt and other carbonaceous substances are the cause of the black color of many sediments. Bluish tints result sometimes from the presence of phosphates or of
fluorite; while green is most frequently seen in rocks which contain glauconite or
Chlorite group.
Impact on society
Rocks have had a huge impact on the cultural and technological advancement of the human race. Rocks have been used by
Homo sapiens and other hominids for millions of years.
Lithic Technology marks some of the oldest and continuously used technologies. The
mining of rocks for their
metal ore content has been one of the most important factors of human advancement. Humanity's advancement has been decided by the kind of metals available from the rocks of a region. The prehistory of civilization is classified into the stone age,
Iron Age, and Bronze Age. Rocks have been and continue to be used to construct buildings and infrastructure. When so used, they are
dimension stone.
See also
References
park in Colorado Springs, CO,
Costa Rica..A
rock is a nature occurring
aggregate of minerals and/or mineraloids. The Earth's lithosphere is made of rock. In general rocks are of three types, namely, igneous, sedimentary, and Metamorphic rock.
Petrology is the scientific study of rocks.
Rock classification
Rocks are classified by mineral and
chemical composition, by the
Texture (geology) of the constituent particles and by the processes that formed them. These indicators separate rocks into igneous rock,
sedimentary rock and
metamorphic rock. They may also be classified according to particle size, in the case of Conglomerate (geology)s and
breccias or in the case of individual
stones. The transformation of one rock type to another is described by the geological model called the
rock cycle.
Igneous
Igneous rocks are formed when molten
magma cools and are divided into two main categories: Intrusion and volcanic. Plutonic or intrusive rocks result when magma cools and crystallizes slowly within the
Earth's crust (example granite), while volcanic or extrusive rocks result from magma reaching the surface either as lava or fragmental ejecta (examples
pumice and basalt) .Blatt, Harvey and Robert J. Tracy, 1996,
Petrology, W. H. Freeman, 2nd ed. ISBN 0-7167-2438-3
Sedimentary
Sedimentary rocks are formed by deposition of either clastic sediments, organic matter, or chemical precipitates (
evaporites), followed by compaction of the particulate matter and cementation during
diagenesis. Sedimentary rocks form at or near the Earth's surface. Mud rocks comprise 65% (
mudstone, shale and siltstone); sandstones 20 to 25% and
carbonate rocks 10 to 15% (limestone and
dolostone).
Metamorphic
Metamorphic rocks are formed by subjecting any rock type (including previously-formed metamorphic rock) to different temperature and
pressure conditions than those in which the original rock was formed. These temperatures and pressures are always higher than those at the Earth's surface and must be sufficiently high so as to change the original minerals into other mineral types or else into other forms of the same minerals (e.g. by recrystallisation).There are also Foliated and nonfoliated rock types.
Classification caveat
The three classes of rocks: the igneous, the sedimentary and the metamorphic — are subdivided into many groups. There are, however, no hard and fast boundaries between allied rocks. By increase or diminution in the proportions of their constituent minerals they pass by every gradation into one another, the distinctive structures also of one kind of rock may often be traced gradually merging into those of another. Hence the definitions adopted in establishing rock nomenclature merely correspond to selected points (more or less arbitrary) in a continuously graduated series. This is frequently urged as a reason for reducing rock classification to its simplest possible terms, and using only a few generalized rock designations. But it is clear that many apparently trivial differences tend regularly to recur, and have a real significance, and so long as any variation can be shown to be of this nature it deserves recognition.
Coloration
Iron oxides and carbonates play a large part in many sedimentary rocks and are especially important as coloring agents. The red sands and limestones, for example, which are so abundant, contain small amounts of iron(III) oxide (hematite), which in a finely divided state gives a red hue to all rocks in which it ispresent. Limonite and goethite, on the other hand, makes rocks yellow or brown;
manganese oxides, asphalt and other carbonaceous substances are the cause of the black color of many sediments. Bluish tints result sometimes from the presence of
phosphates or of
fluorite; while green is most frequently seen in rocks which contain glauconite or Chlorite group.
Impact on society
Rocks have had a huge impact on the cultural and technological advancement of the human race. Rocks have been used by
Homo sapiens and other
hominids for millions of years. Lithic Technology marks some of the oldest and continuously used technologies. The mining of rocks for their
metal ore content has been one of the most important factors of human advancement. Humanity's advancement has been decided by the kind of metals available from the rocks of a region. The prehistory of civilization is classified into the
stone age,
Iron Age, and Bronze Age. Rocks have been and continue to be used to construct buildings and
infrastructure. When so used, they are dimension stone.
See also
References
Rock (geology) - Wikipedia, the free encyclopedia
In geology, rock is a naturally occurring aggregate of minerals and/or mineraloids. The Earth's lithosphere is made of rock. In general rocks are of three types, namely, igneous ...
Free Rock Tumbler Instructions, Rock Polishing Kits, Geology.com
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The polishing step for your rock tumbler - by Geology.com ... Plan for disposal of the used grit and tumbling slurry. Do not dump it down a household drain.
Igneous rock: Geology and mineral planning factsheets for Scotland
Igneous rock: geology and mineral planning factsheet. ... Description: Igneous rock: geology and mineral planning factsheet. ISBN: Official Print Publication Date: June 2007
Igneous rock: Geology and mineral planning factsheets for Scotland
Igneous rock: geology and mineral planning factsheet. ... Title: Igneous rock: Geology and mineral planning factsheets for Scotland
Rock Picture Gallery | Photos of Rocks
Pictures and descriptions of rocks on About.com Geology ... Rock Picture Gallery. IGNEOUS ROCK PICTURES (About Igneous Rocks) Aa —A rugged form of basalt lava.
Hoodoo Rock
Hoodoo rocks, grotesque eroded landforms of deserts around the world, are common in the American West where this photo was taken.
Amazon.co.uk: Edinburgh Rock: The Geology of Lothian: Brian Upton ...
Amazon.co.uk: Edinburgh Rock: The Geology of Lothian: Brian Upton, Euan Clarkson: Books ... Availability: In stock. Dispatched from and sold by Amazon.co.uk. Gift-wrap available.
Rock
ROCK. Whether it be geology, minerology, Rock music, sticks of seaside rock, moon rock, punk rock, or a company that makes laptops, it's all got a firm foundation here! ... Music ...
Rock (geology) - Hutchinson encyclopedia article about Rock (geology)
Hutchinson encyclopedia article about Rock (geology). Rock (geology). Information about Rock (geology) in the Hutchinson encyclopedia.
