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Latest Petrology Stories

blue lava
2015-02-14 09:47:50

Check out these different types of lava and where the best places are to see them.

treasure trove gold
2015-02-06 13:54:05

A chain of gold strata in the Witwatersrand basin of South Africa comprises around 40 percent of all of the gold that has ever been excavated and how this gold got there has baffled geologists for decades.

Easter Island
2015-01-29 14:52:17

The decline of the Rapa Nui culture predated the arrival of Europeans on Easter Island in 1722, indicating those explorers were not the catalyst that led to their demise, according to new research appearing in the journal Proceedings of the National Academy of Sciences.

2015-01-15 23:10:34

Fairfax Marble and United granite are proud to announce the launch of a new website. Chantilly, VA (PRWEB) January 15, 2015 Fairfax Marble and United

Icelandic volcano
2014-12-17 08:10:50

Volcanic eruptions in Iceland are pretty commonplace. Forming new layers of the Earth's crust during an eruption? That's new (at least to us).

2014-10-29 08:28:45

Award-Winning Technology Public Relations Firm Selected Based On Proven Results, Data Transfer Expertise and Dedicated Commitment To High-Tech Industry SCOTTS VALLEY, Calif., Oct.

Holuhraun fissure eruption
2014-10-27 02:30:37

Spectacular eruptions at Bárðarbunga volcano in central Iceland have been spewing lava continuously since Aug. 31. Massive amounts of erupting lava are connected to the destruction of supercontinents and dramatic changes in climate and ecosystems.

detecting water on Mars
2014-10-07 03:00:14

A Washington State University undergraduate has helped develop a new method for detecting water on Mars. Her findings appear in Nature Communications, one of the most influential general science journals.

mount st helens
2014-09-29 07:19:21

Ten years ago Wednesday, Mount St. Helens in Washington erupted after being quiet for nearly two decades, and now US Geological Survey (USGS) scientists are concerned that the volcano could mark the occasion by becoming active once again.

2014-08-27 20:20:22

Obsidian Ranks No. 217 on the 2014 Inc. 500 WASHINGTON, Aug.


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
mitraille
  • Small missiles, especially grape, canister, fragments of iron, and the like, when fired, as upon an enemy at close quarters.
  • To fire mitraille at.
The word 'mitraille' comes from the Old French 'mitaille', meaning 'small coins', sometimes used to mean 'scrap iron'.