Felsic minerals

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The term felsic minerals (outdated: sialic minerals ) is a collective term for the rock-forming silicate minerals quartz , feldspar and the minerals of the foid group . The word felsic is a case word from Fel dspat and Si lica while sialisch from Si Licium and Al uminium , the characterizing elements is contracted from quartz and feldspars and Foiden.

Felsic minerals usually have a light color, which is why they are also referred to as light minerals . However, the color alone is not a sufficient identification feature. B. Calcite , a carbonate mineral, often confused with quartz by laypeople.

Igneous rocks with a high proportion of felsic minerals are known as leucocrate rocks , acidic rocks or Felsite . Most of the igneous rocks that occur in the earth's crust are classified in the QAPF or route iron diagram based on their proportions in certain felsic minerals.

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See also

literature

  • Roland Vinx: Rock determination in the field. P. 25, Springer-Verlag, Berlin Heidelberg 2008, ISBN 3-8274-1513-6 .

Individual evidence

  1. Felsisch. Spectrum online encyclopedia of geosciences, accessed on August 22, 2019.