Gneis, dessen Glimmeranteil zum überwiegenden Teil aus Biotit besteht.
Metamorphic rock derived from quartz, plagioclase feldspar and biotite mica.
2023-10-17T12:19:25.9878320Z
https://www.termdat.bk.admin.ch/entry/66804
Mineralienatlas - Fossilienatlas, Lexikon, "Biotitgneis" ([Internet, 2023-09-13](https://www.mineralienatlas.de/lexikon/index.php/RockData?rock=Biotitgneis))
Northern Geological, Biotite Gneiss – Norway ([Internet, 2023-09-13](https://www.geologysuperstore.com/product/biotite-gneiss-norway/#:~:text=Biotite%20gneiss%20is%20a%20metamorphic,the%20stripes%20of%20a%20zebra.))
CA, Québec, Ministère des Ressources naturelles et des Forêts, Lexique stratigraphique, Complexe de Barry, 2022-05-12 ([Internet, 2023-09-13](https://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-du-superieur/complexe-de-barry/))
swisstopo, Atlante geologico della Svizzera, 1312 Locarno - Note esplicative, 2018, pag. 75
Le gneiss à biotite est composé de quartz, d’oligoclase (...), de microcline, de biotite, de muscovite, d’épidote, de chlorite, de grenat, de sphène, d’apatite, de zircon et de magnétite.
Lungo la strada della Valle Onsernone, sopra Cavigliano, è tutt’oggi in attività una
lavorazione di gneiss biotitico a grana media, conosciuto come «Granito Onsernone» [...].
Mineralienatlas - Fossilienatlas, Lexikon, "Biotitgneis" ([Internet, 2023-09-13](https://www.mineralienatlas.de/lexikon/index.php/RockData?rock=Biotitgneis))
after Northern Geological, Biotite Gneiss – Norway ([Internet, 2023-09-13](https://www.geologysuperstore.com/product/biotite-gneiss-norway/#:~:text=Biotite%20gneiss%20is%20a%20metamorphic,the%20stripes%20of%20a%20zebra.))