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Line 1: − + − Pellant, p. 250 − =Sources= − *Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995) − + + + +
→Sources: clean up & uniformity
[[Igneous rock]] that contains between 45% and 55% total [[silica]]. These have less than 10% [[quartz]] and are rich in [[ferro-magnesian mineral]]s.
'''Basic rocks''' are [[igneous rock]]s that contain between 45% and 55% total [[silica]]. These have less than 10% [[quartz]] and are rich in [[ferro-magnesian mineral]]s.
[[category:geology]]
==Sources==
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995) p. 250
[[Category:Igneous Rocks]]