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Unlike granite, gabbro is low in silica and has no quartz; also gabbro has no alkali feldspar, only plagioclase that often is dark with a high calcium ...
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geology.about.com/od/rocks/ig/igrockindex/rocpicgabbro....
geology.about.com/od/rocks/ig/igrockindex/rocpicgabbro.htm
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Gabbro is a medium or coarse-grained rock that consists primarily of plagioclase feldspar and pyroxene. Essentially, gabbro is the intrusive (plutonic) equivalent of basalt, but whereas basalt is often remarkably homogeneous in mineralogy and composition, gabbros are exceedingly variable.
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geology.csupomona.edu/alert/igneous/gabbro.htm
geology.csupomona.edu/alert/igneous/gabbro.htm
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Texture - Phaneritic ... Your Rock is Gabbro! ... Would you like to learn more about gabbro? Click HERE...
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geology.csupomona.edu/alert/igneous/idgabbro.htm
geology.csupomona.edu/alert/igneous/idgabbro.htm
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Gabbro is a coarse-grained, dark colored, intrusive igneous rock that contains feldspar, augite and sometimes olivine. Gabbro: The specimen shown is about two inches (five centimeters) across. The rock photos above were taken by Ann Bryant ...
http://geology.com/rocks/gabbro.shtml
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Britannica online encyclopedia article on gabbro (rock), any of several medium- or coarse-grained rocks that consist primarily of plagioclase feldspar and pyroxene. ... Essentially, gabbro is the intrusive (plutonic) equivalent of basalt, but whereas basalt is often remarkably homogeneous in mineralogy and composition,
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www.britannica.com/EBchecked/topic/223075/gabbro
www.britannica.com/EBchecked/topic/223075/gabbro
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Origin of gabbro – Our etymology dictionary has the origin of the word gabbro. Encyclopedia.com: Origins of over 17,000 words. ... VMS Ventures Reports Drill Results of Nickel Targets on the Carr Lake Gabbro Plug and Preliminary VTEM Results on Its Lynn Lake Gabbros Project in Manitoba, Canada.; News Wire article...
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www.encyclopedia.com/doc/1O27-gabbro.html
www.encyclopedia.com/doc/1O27-gabbro.html
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Opinions expressed on Green Gabbro are well-reasoned and insightful. Needless to say, they are not those of my employers, Seed Media Group, or anyone on my thesis committee. Disclaimers expressed on this blog may be those of the Whad'Ya Know?
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scienceblogs.com/greengabbro/
scienceblogs.com/greengabbro/
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GABBRO: An igneous-plutonic rock, generally massive, but may exhibit a layered structure produced by successive layers of different mineral composition. It is widely used as crushed stone for concrete aggregate, road metal, railroad ballast, etc.
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www.coaleducation.org/lessons/wim/20.htm
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