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[[Igneous rock]] that contains between 45% and 55% total [[silica]]. These have less than 10% [[quartz]] and are rich in [[ferro-magnesian mineral]]s.
Pellant, p. 250
=Sources=
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
[[category:geology]]
Pellant, p. 250
=Sources=
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
[[category:geology]]