Difference between revisions of "Basic Rock"
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Revision as of 17:47, May 25, 2007
Igneous rock that contains between 45% and 55% total silica. These have less than 10% quartz and are rich in ferro-magnesian minerals.
Pellant, p. 250
Sources
- Pellant, Chris. The Complete Book of Rocks and Minerals, Dorling Kindersley Inc.: New York (1995)