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andesite

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
an·de·site  (nd-zt)
n.
A gray, fine-grained volcanic rock, chiefly plagioclase and feldspar.
[After the Andes.]
andesite [ˈændɪˌzaɪt]
n
(Earth Sciences / Geological Science) a fine-grained tan or grey volcanic rock consisting of plagioclase feldspar, esp andesine, amphibole, and pyroxene
[from Andes + -ite1]
andesite  (nd-zt)
A gray, fine-grained volcanic rock. Andesite consists mainly of sodium-rich plagioclase and one or more mafic minerals such as biotite, hornblende, or pyroxene. It often contains small, visible crystals (phenocrysts) of plagioclase. It is the fine-grained equivalent of diorite.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.andesite - a dark grey volcanic rock
igneous rock - rock formed by the solidification of molten magma


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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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