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Line 1: − + − Pellant, p. 251+ − + − − *Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
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An '''ultrabasic rock''' is an [[igneous rock]] having less than 45% total [[silica]].
An '''ultrabasic rock''' is an [[igneous rock]] having less than 45% total [[silica]].<ref>Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995). p. 251</ref>
==References==
{{reflist}}
==Sources==
[[Category:Igneous Rocks]]
[[Category:Igneous Rocks]]