All known trioctahedral brittle micas are shown to be similar, particularly in respect to chemical composition, crystallography, and geological occurrence. Thus there is no need for such species and varietal names as xanthophyllite, valuevite, brandisite, disterrite, holmite, holmsite, holmesite, and chrysophane. Arguments are given for choosing clintonite rather than seybertite as the species name.

A new chemical analysis of clintonite is given: SiO2 19.38, Al2O3 39.69, Fe2O3 0.35, FeO 1.48, CaO 12.72, MgO 20.99, Mn 0.001, SrO 0.14, H20 3.04, F 1.91, Cl 0.07.

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