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Latest Petrology Stories

2012-03-28 10:22:49

MENLO PARK, Calif., March 28, 2012 /PRNewswire/ -- SRI International Sarnoff's Iris on the Move® (IOM) N-Glance(TM) identification system is now protecting access to EGL USA's New York laboratory by confirming the identity of authorized employees as they enter. EGL USA, the industry leader in gemological science and service, is the first gemological laboratory to use this type of identification system for security purposes. "Security is a critical part of our business," said Mitch...

2012-03-20 06:21:14

VANCOUVER, March 20, 2012 /PRNewswire/ - Search Minerals Inc. ("Search" or the "Company") (TSXV: SMY) and its wholly-owned subsidiary, Alterra Resources Inc., are pleased to announce the discovery of the Fox Pond and Foxy Lady rare earth element (REE)-Zr-Y-Nb prospects in the Port Hope Simpson REE District in SE Labrador. Encouraging analyses of several grab samples and channel samples from these prospects show concentrations of REE, Nb, Zr and Y equal to or greater than that of the...

Image 1 - Dutch Scientists Analyze Lack Of Lunar Volcanoes
2012-02-20 05:22:27

A team of Dutch scientists believe that they have discovered why there are no active volcanoes on the Moon, even though recent seismic activity suggests that there is a good amount of magma below the surface. According to Olivia Solon of Wired.co.uk, Mirjam van Kan Parker and Wim van Westrenen from VU University Amsterdam and their colleagues produced microscopic copies of moon rock collected during the Apollo missions, then melted them at extremely high pressures and temperatures in order...

Image 1 - Building Blocks Of Early Earth Survived Collision That Created Moon
2012-02-18 06:32:01

Unexpected new findings by a University of Maryland team of geochemists show that some portions of the Earth's mantle (the rocky layer between Earth's metallic core and crust) formed when the planet was much smaller than it is now, and that some of this early-formed mantle survived Earth's turbulent formation, including a collision with another planet-sized body that many scientists believe led to the creation of the Moon. "It is believed that Earth grew to its current size by collisions...

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,...

2012-01-10 09:19:00

TSX: GPD VANCOUVER, Jan. 10, 2012 /PRNewswire/ - Golden Predator Corp. (TSX: GPD) (the "Company") is pleased to announce a new gold discovery at the Company's previously undrilled Cache Creek Project (formerly known as the Harlan Project) in the central Selwyn Basin, Yukon, Canada. The initial six hole, 2,029 m diamond drilling program completed in 2011 encountered significant gold mineralization in four of six drill holes with all drill holes intersecting extensive intervals of...


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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