siderophyllite

siderophyllite

[‚sid·ə·rə′fil‚īt]
(mineralogy)
An iron-rich variety of biotite.
References in periodicals archive ?
1,5] micas [left arrow] Increasing amounts of Si Increasing Eastonite amount of Fe K-Mg,Al [left arrow] Siderophyllite K-[Fe.
As typical for biotites from peraluminous granites (de Albuquerque 1973, Speer 1987, Villaseca and Barbero 1994), they show a high Mn content and also a high siderophyllite component (Fig.