ilmenite

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a weakly magnetic black mineral found in metamorphic and plutonic rocks

References in periodicals archive ?
Neumann, E.-R.: 1974, The distribution of [Mn.sup.2+] and [Fe.sup.2+] between ilmenites and magnetites in igneous rocks, Amer.
Titanite CaTiOSi[O.sub.4] together with ilmenite FeTi[O.sub.3] and magnetite [Fe.sub.3][O.sub.4] are common accessory minerals in a wide range of igneous and metamorphic rocks.
Quartz, ilmenite, magnetite, titanite, rutile, apatite and sulphides (pyrite, chalcopyrite) are accessories.
Titanite, together with Fe-Ti oxides (magnetite, ilmenite), usually forms subhedral grains and/or grain aggregates in amphibolites.
The Fe content in titanites which form reaction rims around ilmenite is low, about 0.02 a.p.f.u.
Ilmenite is a widespread Fe-Ti oxide in magmatic rocks as well as in regionally metamorphosed rocks, in both metapelites and metabasites (e.g., Carmichael, 1967; Thompson, 1972; Neumann, 1974; Rumble, 1976; Ghent et al., 1983; Ghent and Stout, 1984).
In metamorphic rocks, the ulvospinel component is usually totally exsolved, and titaniferous magnetite is oxidized to an admixture of Ti-low magnetite and ilmenite.
In amphibolites from the Chynov area, intergrowths of individual magnetite grains with ilmenite grains were found.
Furthermore, minerals common to both series (chromite, olivine, augite, plagioclase, magnetite and ilmenite) are compositionally distinct reflecting fundamental chemical differences between the two magma series.
Both alkali and tholeiitic basalts contain chromite as an early crystallizing phase, and form magnetite and/or ilmenite over a large range of temperatures.
De plus, les mineraux communs a ces deux series (chromite, olivine, augite, plagioclase, magnetite et ilmenite) ont des compositions distinctes qui refletent les differences de composition chimique intrinseques de ces deux series magmatiques.