A poorly defined material, possibly a weathering product of biotite or interlayer-deficient biotite.
A poorly defined material, possibly a weathering product of biotite or interlayer-deficient biotite.
See volkonskoite.
A dioctahedral member of the smectite group with the dominant octahedral cation of Cr. The layer charge may originate by either tetrahedral or octahedral substitutions.
Syn., volkhonskoite
An obsolete varietal term for zinnwaldite, lithian annite, lithian siderophyllite (‘Raven mica’ or ‘crow mica’ in Russian).
A discredited term for oriented intergrowths of hausmannite + jacobsite.
A general term, now obsolete, to describe any poorly defined, fine grained manganese oxide with black or dark brown earthy, dull luster.
Cf., psilomelane.
A poorly defined material, possibly a mica.
An obsolete varietal term for clintonite.
An obsolete varietal term for clintonite.
An obsolete varietal term for clintonite.