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Hydromuscovite

A synonym
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About HydromuscoviteHide

Synonym of:
Rieder et al. (1988) considered this name to be synonymous with illite. They use the name illite vaguely, as a compositional space for any interlayer-deficient dioctahedral mica. However, they also suggested that all hydromicas (=interlayer-deficient micas) could be considered to be mixed layer structure minerals, and thus illite may be an interlayered mica and smectite.

The name hydromuscovite is typically used to refer to fine grained, often pale green, interlayer deficient muscovite (i.e. potassium deficient), but the literature is full of inappropriately named examples. Hydromuscovite probably does not exactly equal “illite" in all cases; some may be just fine grained muscovite and some may be mixed layer phyllosilicates.

Probably equivalent terms are Damourite, Bachelorite, Gilbertite, Sericite and Pinite.

The name is probably best avoided.


Unique IdentifiersHide

Mindat ID:
9603
Long-form identifier:
mindat:1:1:9603:0

Synonyms of HydromuscoviteHide

Other Language Names for HydromuscoviteHide

Varieties of HydromuscoviteHide

Calcium-GümbeliteA Ca-bearing hydromuscovite pseudomorphous after plagioclase.

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Hydromuscovite associated with QuartzSiO2
1 photo of Hydromuscovite associated with Hingganite-(Ce)(Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2
1 photo of Hydromuscovite associated with ZirconZr(SiO4)
1 photo of Hydromuscovite associated with TopazAl2(SiO4)(F,OH)2
1 photo of Hydromuscovite associated with CleavelanditeNa(AlSi3O8)
1 photo of Hydromuscovite associated with AntigoriteMg3(Si2O5)(OH)4

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Hydromuscovite in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

Internet Links for HydromuscoviteHide

References for HydromuscoviteHide

Reference List:

Localities for HydromuscoviteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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