See hydrotalcite group.
See hydrotalcite group.
An obsolete term for nontronite.
An obsolete term for glauconite.
A poorly defined material, found as infillings in cavities in basic igneous rocks, possibly an altered chlorite.
An obsolete varietal term for biotite.
A dioctahedral member of the true mica group. The ideal end-member formula is KCrMg□(Si4O10)(OH)2 where □ = vacancy. First discovered at the Srednyaya Padma U-V deposit, chromceladonite was described from southern Karelia, Russia, in occurrences relating to apparent metasomatism and in association with dolomite, calcite, hematite, quartz, roscoelite, chromphyllite, uraninite, zincochromite, vanadium oxides and selenides (Pekov et al., 2000). Chromceladonite occurs as a 1M polytype.
Cf., chromphyllite
An obsolete term for chromian muscovite, chromian phengite.
An obsolete term for chromian muscovite, chromian phengite.
An obsolete term for chromian muscovite.
A dioctahedral member of the true mica group. The ideal end-member formula is KCr2□AlSi3O10(OH,F)2, where □ = vacancy. Chromphyllite, like muscovite, occurs as the 2M1 polytype in C2/c symmetry, and the Cr forms a solid solution series with Al in muscovite. Chromphyllite is known from the Lake Baikal region, Russia, Outokumpu, Finland, and elsewhere, and is believed to occur in association with metasomatism.
Cf., muscovite