Latest Metamorphic rocks Stories
Can an abandoned mine help with the fight against global warming? Researchers from Stanford University think so. They have been using an abandoned mine to gain new insights on how to permanently entomb greenhouse gas emissions inside the Earth.
(PRZCF.OTCBB) (PH0.FRANKFURT) (TSXV.GR) VANCOUVER, Aug. 23 /PRNewswire-FirstCall/ - GREENLIGHT RESOURCES INC. (TSXV.GR), announces that it has received preliminary results from its mapping and prospecting on its Brazil Lake Lithium and Rare Metal property in Nova Scotia.
A new analysis of jade found along the Motagua fault that bisects Guatemala is underscoring the fact that this region has a more complex geologic history than previously thought.
To slow global warming, scientists are exploring ways to pull carbon dioxide from the air and safely lock it away.
By Rakovan, John The very first Word to the Wise column dealt with the term pegmatite (Rakovan 2003). This was especially fitting because pegmatites are one of the most important rock types or geologic environments for the production of beautiful and interesting mineral specimens.
By Anonymous THE TWENTY-FOURTH TECHNICAL SESSION of the Rochester Mineralogical Symposium (RMS) was held on 13 April 2007. Twelve abstracts were accepted and presented as oral papers. The review panel consisted of Dr. Steven Chamberlain, New York State Museum; Dr.
Earth scientists are in the business of backing into history -- extrapolating what happened millions of years ago based on what they can observe now.
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...
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...
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...
Garnierite is a mineral composed of hydrous nickel silicates a member of the serpentine group with formula: (Ni,Mg)3Si2O5(OH). NÃ©pouite is a synonym. Garnierite is important as a source of nickel and is mined from laterite deposits which are formed by intense weathering and secondary enrichment of ultramafic igneous rocks.
Gneiss is a common and widely distributed type of rock formed by high grade regional metamorphic processes from preexisting formations that were originally either igneous or sedimentary rocks. Gneissic rocks are coarsely laminated and largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc. However, depending on their composition,...
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