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An '''ultrabasic rock''' is an [[igneous rock]] having less than 45% total [[silica]].
Pellant, p. 251
==Sources==
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
[[category:Igneous rocks]]
Pellant, p. 251
==Sources==
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
[[category:Igneous rocks]]