The name Felsit is a case word made of feldspar (English feldspar ) and silica (English for silicon dioxide ). The corresponding adjective is felsic . Since quartz consists of silicon dioxide (SiO 2 ) - often chemically incorrectly referred to as silicic acid - the term acidic rock is often used for Felsite . However, both names are not fully synonymous , since felsic refers to the mineral stock and acidic to the chemical composition, in particular of the magma or lava from which the rock emerged. Therefore, only unmetamorphic igneous rocks are called acidic .
The adjective felsitic also stands for a fine-grained to dense structure of felsic rocks characterized by no special morphological grain formation.
- Wolfhard Wimmenauer : Petrography of igneous and metamorphic rocks . Enke, Stuttgart 1985, ISBN 3-432-94671-6
- Acid rock in the Imperial College Rock Library , Imperial College London (English)
- Felsisch. Spectrum online encyclopedia of geosciences, accessed on August 22, 2019.