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f6c2e4a78727ab04766caef0a2b7fedd
2009-04-07 09:01:32

Scientists study how microbes survive and thrive in deep, dark, noxious, oxygen-depleted, super-salty ecosystems that may resemble primordial environments Scientists have completed the first study of microbes that live within the plumbing of deep-sea mud volcanoes in the Gulf of Mexico, where conditions may resemble those in extraterrestrial environments and early Earth. The study, which was partially funded by the National Science Foundation (NSF), was conducted in an area where clusters of...

2009-04-06 09:46:00

HOUSTON, April 6 /PRNewswire-USNewswire/ -- Visitors will have the rare chance to touch a piece of a moon rock this weekend in the new NASA Driven to Explore traveling exhibit at the Kansas Aviation Museum. (Logo: http://www.newscom.com/cgi-bin/prnh/20081007/38461LOGO ) Driven to Explore offers a look at America's program to return humans to the moon and travel beyond. The exhibit will be open 10 a.m. to 5 p.m. Friday, April 10, and Saturday, April 11. The centerpiece of Driven to...

106dfa6ce7e739d62df4cc24962243791
2009-03-31 08:29:35

New spin on laser-flash analysis Putting a new spin on an old technique, Anne M. Hofmeister, Ph.D., research professor of earth and planetary sciences in Arts & Sciences at Washington University in St. Louis, has revolutionized scientists' understanding of heat transport in the Earth's crust, the outermost solid shell of our planet. Temperature is an important driver of many geological processes, including the generation of magmas (molten rocks) in the deepest parts of the Earth's crust,...

2009-03-23 10:26:17

U.S. geologists say they've determined that as rocks become hotter in the Earth's crust, they become better insulators but poorer conductors. The University of Missouri scientists said their findings from a study of how well rocks conduct heat at different temperatures provide insights into how magmas are formed and will possibly lead to better models of continental collision and the formation of mountain belts. These results shed important light on a geologic question: how large bodies of...

eca97d86d0613e4aa3f09e8f9e03ef4b1
2009-03-19 08:28:14

MU researchers found that strain heating can play an important role in crustal melting A University of Missouri study published in Nature this week has found that the Earth's crust melts easier than previously thought. In the study, researchers measured how well rocks conduct heat at different temperatures and found that as rocks get hotter in the Earth's crust, they become better insulators and poorer conductors. This finding provides insight into how magmas are formed and will lead to...

db1d5ec6b552e092abb3ba1ab71c61c51
2009-02-17 11:20:38

The argument over whether an outcrop of rock in South West Greenland contains the earliest known traces of life on Earth has been reignited, in a study to be published in the Journal of the Geological Society on 23 February. The research, led by Martin J. Whitehouse at the Swedish Museum of Natural History, argues that the controversial rocks "Ëœcannot host evidence of Earth's oldest life', reopening the debate over where the oldest traces of life are located. The small island of...

2009-02-04 16:43:00

TSX-V: RES VANCOUVER, Feb. 4 /PRNewswire-FirstCall/ - Rare Element Resources Ltd. (TSX-V:RES) is pleased to announce rare-earth-element (REE) assay results from four holes of the 2008 core drilling program completed on the Company's 100% owned Bear Lodge Property located in northeastern Wyoming, USA. Three of the holes were drilled into the Bull Hill Southwest target, where a historical resource had been previously estimated. The fourth hole was drilled to test an area with both REE and gold...

2008-12-19 00:19:42

Geologists say an undisturbed chamber of molten rock in Hawaii is offering new insight into the way continental rock is formed. The magma, discovered in 2005 when a geothermal power company drilled a mile and a half deep on one of the islands, is the first contact scientists have had with the molten rock from anywhere other than a volcano, The Washington Post reported Thursday. This is Jurassic Park. This is first contact. Here we see this (continental) stuff being produced in its natural...

2008-12-18 09:03:00

NEWPORT BEACH, Calif., Dec. 18 /PRNewswire-FirstCall/ -- Collectors Universe, Inc. (Nasdaq: CLCT), a leading provider of value-added authentication and grading services to dealers and collectors of high-value collectibles, diamonds and colored gemstones, today announced that Chief Executive Officer Michael Haynes will present at the 11th Annual Needham Growth Stock Conference on Tuesday, January 6, 2009 at 2:30 p.m. ET at The New York Palace Hotel in New York City. A live and archived...


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
drawcansir
  • A blustering, bullying fellow; a pot-valiant braggart; a bully.
This word is named for Draw-Can-Sir, a character in George Villiers' 17th century play The Rehearsal.
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