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Latest Petrology Stories

Lava Formations In Western US Linked To Tear In Giant Slab Of Earth
2012-02-17 04:04:00

Scripps scientists propose mass melting as new force behind volcanic activity in Columbia River region Like a stream of air shooting out of an airplane's broken window to relieve cabin pressure, scientists at Scripps Institution of Oceanography at UC San Diego say lava formations in eastern Oregon are the result of an outpouring of magma forced out of a breach in a massive slab of Earth. Their new mechanism explaining how such a large volume of magma was generated is published in the Feb....

High-Pressure Phase Changes Could Play Role In Exoplanet Formation
2012-02-12 05:37:38

Phase transitions in liquid magmas at the pressure and temperature levels that exist deep within Earth-like planets could play a role in the formation of new worlds, according to a new research put forth by experts at California's Lawrence Livermore National Laboratory (LLNL). According to a Friday UPI article, the process is similar to the way that graphite, when placed in high-pressure conditions, can transform into diamonds. In much the same way, the LLNL researchers assert that molten...

2012-01-23 14:03:33

How diamond-bearing kimberlites reach the surface Kimberlites are magmatic rocks that form deep in the Earth´s interior and are brought to the surface by volcanic eruptions. On their turbulent journey upwards magmas assimilate other types of minerals, collectively referred to as xenoliths (Greek for “foreign rocks”). The xenoliths found in kimberlite include diamonds, and the vast majority of the diamonds mined in the world today is found in kimberlite ores. Exactly how...

Iberian Coast Ocean Drilling Expedition Reports Early Findings
2012-01-23 12:10:57

Underwater river of mud and sand tells tale of climate change and ocean gateways, new oil and gas exploration possibilities Mediterranean bottom currents and the sediment deposits they leave behind offer new insights into global climate change, the opening and closing of ocean circulation gateways and locations where hydrocarbon deposits may lie buried under the sea. A team of 35 scientists from 14 countries recently returned from an expedition off the southwest coast of Iberia and the...

2012-01-13 08:00:00

The biological and geographical website EurekaMag.com publishes reviews of specific subjects of all areas of biological and geographical science. The latest insights cover Homo sapiens which are the only living species in the Homo genus, originated in Africa about 200,000 years ago and reaching full behavioral modernity around 50,000 years ago. The latest review is about the three main rock types Igneous Rocks, Metamorphic Rocks and Sedimentary Rocks. Mannheim, Germany (PRWEB) January 13,...

Moon Mineral Discovered In Western Australia
2012-01-09 09:40:57

An Australian paleontologist has discovered a mineral, long thought to be found only on the moon, in a billion-year-old rock formation in Western Australia. The mineral, tranquillityite, was first discovered by astronauts visiting the moon during the Apollo 11 mission in 1969, where it was scooped up at the Sea of Tranquility and brought back to Earth to be studied. It was one of three minerals collected on the lunar surface, and the only one of the three, that has not been found anywhere...

NASA Missing Hundreds Of Moon Rocks
2011-12-09 12:07:29

An audit of NASA has turned up evidence that hundreds of moon rocks and other space matter are apparently missing, many of which have been loaned out by the space agency. NASA Inspector General Paul Martin on Thursday issued a report stating that more than 500 pieces of moon rocks, meteorites, and other debris from space were either stolen or have been missing since 1970. That includes 218 moon samples that were stolen and later returned and about two dozen moon rocks and pieces of moon...

2011-11-16 08:00:00

Adya Inc., a Coldwater, Michigan company providing mineral waters with extraordinary properties, has a new website, found at adyaclarity.com. It is chalk full of information as regards the product, its production, and recommended usage. Pleasant Lake, MI (PRWEB) November 16, 2011 Adya Inc., a Coldwater, Michigan company providing mineral waters with extraordinary properties, has a new website, found at adyaclarity.com. It is chalk full of information as regards the product, its...


Latest Petrology Reference Libraries

28_e9750264d5476c85f9be09d17bc6fd51
2005-05-26 12:03:39

Biotite is a common phyllosilicate mineral that contains potassium, magnesium, iron and aluminium. It is sometimes called "iron mica" and is found in granitic rocks, gneisses, and schists. Like other mica minerals, biotite has a highly perfect basal cleavage, its flexible sheets easily flaking off. It has a hardness of 2.5 - 3, a specific gravity of 2.7 - 3.1, is colored greenish to brown or black, and can be transparent to opaque. Biotite is occasionally found in large sheets, especially in...

28_56635877b282726a86b25cf3e98722c2
2005-05-26 11:30:45

Chert is a fine-grained silica-rich cryptocrystalline sedimentary rock that may contain small fossils. It varies greatly in color from white to black, but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements present in the rock, and both red and green are most often related to traces of iron (in its oxidized and reduced forms respectively). It outcrops as nodules in limestone, chalk, and dolostone formations as a...

28_42121cee4c09c0898f52263bea588d54
2005-05-26 11:26:59

Chromite, iron magnesium chromium oxide: (Fe,Mg)Cr2O4, is an oxide mineral belonging to the spinel group. Magnesium is always present in variable amounts, also aluminium and iron substitute for chromium. Chromite is found in peridotite and other layered ultramafic intrusive rocks and also found in metamorphic rocks such as serpentinites. Ore deposites of chromite form as early magmatic differentiates. It is commonly associated with olivine, magnetite, serpentine, and corundum. Chromite is...

28_b760796d3dace508242e89fc53d49081
2005-05-26 11:13:08

In geology, a conglomerate is a rock consisting of other stones that have been cemented together. Conglomerates are sedimentary rocks consisting of subangular clasts and are thus differentiated from breccias, which consist of angular clasts. Both conglomerates and breccias are characterized by clasts larger than sand (>2 mm). There are two varieties of conglomerate, defined by texture: paraconglomerates and orthoconglomerates. Paraconglomerates are one of two varieties of conglomerate...

28_0d277ca2b0d8b8cd79fb9cfa322f77e1
2005-05-26 11:01:52

Diorite is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), hornblende, and/or pyroxene. Varieties deficient in hornblende and other dark minerals are called leucodiorite. It is often described as "salt and pepper" when composed largely of light-colored minerals randomly interspersed with dark minerals. When olivine and more iron-rich augite are present, the rock grades into ferrodiorite, which is transitional to...

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Word of the Day
glogg
  • Scandinavian punch made of claret and aquavit with spices and raisins and orange peel and sugar.
This word comes from the Swedish 'glogg,' which is an alteration of 'glodgat,' mulled (wine).
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