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Definitions for "Ultrabasic" Add To Word List
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Keywords: Silica, Igneous, Ahdos, Ferromagnesian, Plutonic
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An igneous rock that consists of ferromagnesian minerals and possesses no free quartz, and with less than 45% silica.
http://www.new-millennium.com.au/glossary.php
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Describing an igneous rock containing magnesium and iron with a very low percentage of silica, less than 45%.
http://www.inlandlapidary.com/user_area/glossaryU.asp
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Igneous rock containing less than 45 per cent silica.
http://minebox.com.au/mining_glossary.asp
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igneous rock with very low silica content
http://niocan.com/content.asp?SectionID=37
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plutonic or volcanic rock having a silica content (SiO2) less than 45 %.
http://perso.orange.fr/jacques.delfour/glossre.htm
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extremely rich in base-forming elements and poor in silica. [AHDOS
http://www.memphisgeology.org/glossary_uz.htm
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