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: http://dx.doi.org/10.2138/am.2012.4023).

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The authors provide corrected formulas for tobelite:

 

[K0.18Na0.01(NH4+)0.62]Σ=0.81(Al1.98Fe0.022+)Σ=2.00(Si3.19Al0.81)Σ=4.00O10.00(OH)2.00

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and for NH4+-rich muscovite

 

[K0.46Na0.03Ba0.01...

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