An obsolete varietal term for Fe²⁺-rich saponite

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A description of the interactive forces occurring between a pair of neutral atoms or molecules. The potential is comprised of force-field terms: at long-separation distances, van der Waals attraction predominates, whereas at short-separation distances, strong repulsion predominates as a result of the Pauli exclusion principle. The Lennard-Jones potential is accurate for noble gas interactions and a relatively good model for most neutral atoms and molecules. The Lennard-Jones potential is computationally simple and thus commonly used in modeling programs.

Mg analogue of stilpnomelane.
See stilpnomelane

An obsolete name for altered material, probably vermiculite.

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.