See boehmite.

A series name for trioctahedral micas on or close to the trilithionite-polylithionite join. Also used to describe light-colored micas with a significant amount of lithium. Lepidolite is useful as a field term for micas that have not been completely analyzed compositionally, that are commonly found in pegmatite, that have a pink or whitish color. In general, lepidolite, as distinguished from muscovite, commonly crystallizes as the 1M polytype, whereas muscovite is commonly the 2M₁ polytype. Lithium is not a chromophore and does not impart the pink color to lepidolite; the presence of Mn probably imparts the pink color to lepidolite.

An obsolete varietal term for annite, siderophyllite, tetra-ferri-annite, and biotite.

An obsolete term for phengite.

An obsolete term for an iron-rich chlorite.

A poorly defined material, possibly margarite or a mineral mixture.

An obsolete term for a near iron-free chlorite from the Ural mountains.

An obsolete term for aluminoceladonite.

A poorly defined material, probably not a mica, possibly containing halloysite.

See liquid holding capacity.