Tobelite and NH4+-rich muscovite single crystals from Ordovician Armorican sandstones (Brittany, France): Structure and crystal chemistry by Ernesto Mesto, Fernando Scordari, Maria Lacalamita, and Emanuela Schingaro (vol. 97, p. 1460–1468, 2012: DOI:


The authors provide corrected formulas for tobelite:




and for NH4+-rich muscovite



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