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099cec4c8789bf062c9fb08611ba104a1
2009-06-08 07:30:00

Billions of years of history have been uncovered with a new technique that is helping scientists paint a picture of how Earth’s continents were arranged.

2009-05-11 16:58:59

U.S.

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2009-05-07 08:38:46

Science has unearthed the secret to what might have been alchemy at Oldoinyo Lengai volcano in Tanzania.

2009-04-23 09:55:00

NEW YORK, April 23 /PRNewswire/ -- Crystal Research Associates, LLC announced today that it has issued an Executive Informational Overview(R) (EIO(R)) on Visible Gold Mines Inc. (TSX: VGD). The full 52-page report can be found at www.crystalra.com. Visible Gold Mines Inc.

2009-04-08 15:10:46

U.S. scientists say they've completed the first study of microbes living in deep sea volcanoes, where conditions may resemble extraterrestrial environments. The Gulf of Mexico study was led by Professor Samantha Joye of the University of Georgia.

2009-04-08 10:14:00

HOUSTON, April 8 /PRNewswire-USNewswire/ -- Visitors will have the rare chance to touch a piece of a moon rock this week in the new NASA Driven to Explore trailer at the University of Kansas. (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.

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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.

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.

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

Putting a new spin on an old technique, Anne M Hofmeister, PhD, 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.


Latest Petrology Reference Libraries

Chaitén
2014-08-28 10:38:21

Chaitén is a volcanic caldera that is located in southern Chile that reaches an elevation of 3,681 feet. It is thought that this volcano once held a rhyolite obsidian lava dome that reached 3,156 in height, but this was destroyed after its most recent eruption in 2008. In the past, this volcano has released grey obsidian, which was used by pre-Columbian cultures to make many objects, some of which have been found 250 miles away from the volcano. Chaitén experienced the beginning of a new...

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...

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Word of the Day
ecotone
  • A transitional zone between two communities containing the characteristic species of each.
The word 'ecotone' comes 'eco-' plus a Greek root meaning 'tension'.