" features reflections at 2.441 nm and 1.221 nm corresponding to the lattice planes (001) and (002), respectively [31, 32].
Experimental conversion of biotite to hydrobiotite
. Nature, 226: 841-842
The minerals sensitive to HCl are iron calcite, iron dolomite, hematite, pyrite, magnesium iron ore, glauconite, hydrobiotite
. The minerals sensitive to HF are calcite, dolomite, calcium feldspar, zeolites, and various types of clay minerals.
The gangue minerals identified comprised of mainly calcite, quartz, epidote, magnetite, muscovite, hydrobiotite
, sapphirine and graphite.
Xu, "Structure of cetyltrimethylammonium intercalated hydrobiotite
," Applied Clay Science, vol.
In the case of all samples two main phases of hydrobiotite
(peaks of high intensity at 1.223, 0.349, 0.491, 0.272 nm) (Downs, 2006) and biotite (peaks of high intensity at 1.01, 0.337, 0.266 nm) (Downs, 2006) were identified, although it seems that hydrobiotite
is dominating in the samples without [K.sup.+] ion exchange.
It was further identified by JCP.CAT search/match programme of X-ray Diffractometer D-5000 (Siemens, Germany) that the other peaks corresponded to the gangue minerals which mostly comprised of calcite (CaCO3), epidote [Ca.sub.2], [Al.sub.3] (Si[O.sub.4])([Si.sub.2][O.sub.7]) (O, OH), magnetite ([Fe.sub.3][O.sub.4]), hydrobiotite
K[(Mg,Fe).sub.3] (Al, [Si.sub.3][O.sub.10]) (OH, [F).sub.2], muscovite K, [Al.sub.2] (Al, [Si.sub.3] [O.sub.10]) (OH, F), sapphirine [Mg.sub.3.5], [Al.sub.9] [Si.sub.1.5] [O.sub.20] and predominant quantities of quartz (Si[O.sub.2]).
Two main phases were identified: hydrobiotite
(peaks of high intensity at 1.223, 0.349, 0.491, 0.272 nm) (Downs, 2006) and biotite (peaks of high intensity at 1.01, 0.337, 0.266 nm) (Downs, 2006).
Dioctahedral regular interstratifications of this type are: rectorite (Il-Sm, with [K.sup.+] or [Na.sup.+] mica) and tosudite (Ch-Sm); trioctahedral are: aliettite (Ta-Sa), corrensite (Ch-Sm which is low charge, and Ch-Ve which is medium charge), dozyite (Sp-Ch), hydrobiotite
(Bi-Ve), kulkeite (Ta-Ch), and Bi-Ch which is not yet named.
Petrographic observations indicate that growth of vermiculite observed in the ultramafic samples occurred after the formation of biotite through an intermediate stage of hydrobiotite
, in agreement with studies of vermiculite deposits elsewhere (Prasad and Majumdar, 1966; Nettleton et al., 1973; Tarzi and Protz, 1979; Ghabru et al., 1987).
Melka K., Ulrych J., Mikulas R.: Hydrobiotite
from the Detan Oligocene Tuffs (Doupovske Hory Mts.)
Marel, 1968), tosudite (di Ch-di Mo, Sudo and Kodama, 1957; Frank-Kamenetsky et al., 1965), Ka-Mo (not named, Altschuler et al., 1963), hydrobiotite
(Bi-Ve, Veniale and v.d.