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andesite

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andesite

Volcanic igneous rock, intermediate in silica content between rhyolite and basalt. It is characterized by a large quantity of feldspar minerals, giving it a light colour. Andesite erupts from volcanoes at destructive plate margins (where one plate of the Earth's surface moves beneath another; see plate tectonics), including the Andes, from which it gets its name.



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However, the rover's study of a Martian rock called Barnacle Bill indicates that it resembles andesite, a volcanic rock often formed by several cycles of heating and cooling, although not as many as granite.
Martian rocks offer a windy tale by Cowen, Ron / Science News
TOC 06-44 was drilled along the same cross section as drill hole TOC 06-43, but aimed in the opposite direction, to probe the width of the capping andesite and to define the eastern limit of shallow gold mineralization just beyond the andesite.
Strong Phase IV Final Drilling Results at Tocantinzinho by Business Wire
The Main San Jacinto vein, ranges in width from two to over 20 meters, is composed dominantly of vein breccia, probably of hydrothermal origin, with a fine-grained quartz-chalcedony matrix containing up to 20% silicified andesite and vein fragments.
Intrepid Minerals Defines Extent of New Vein System in Eastern El ... by Business Wire
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