% and is enriched in the MnTi[O.sub.3] (pyrophanite
) component (5-8 mol.
The examined ilmenites typically have FeTi[O.sub.3] amounts above 96 mol.%, only some ilmenite grains are partly enriched in the MnTi[O.sub.3] (pyrophanite
) component in amounts reaching 9 mol.% in some samples (Table 2).
Occurrence: At Rasvumchorr, in veinlets cross-cutting natrolite of ristscorrite pegmatite; associated minerals are: microcline, aegirine, annite, astrophyllite, magnetite, fluorapatite, pyrophanite
, thomsonite-Ca, etc.
(1967) Find of pyrophanite
and melanophlogite in Chvaletice (E.
The syenite pegmatites contain calcium catapleiite, titanium-rich lavenite, lorenzenite, cesium-rich astrophyllite, kupletskite, pyrophanite
, leucophanite, strontium-apatite, loparite, calcium-rich seidozerite, strontium-rich and zirconium-rich perrierite, brookite, landauite, murataite, polylithionite, brewsterite, chabazite, monazite, ancylite, bertrandite, vlasovite, hambergite.
Sparse, 5-mm to 10-cm long crystals of ilmenite grading to pyrophanite
were found at the upper contact of the amazonite-topaz zone with the perthite zone, in association with microcline, quartz, magnetite, zircon and thorite.
** = Electron microprobe analyses; average of 25 points; standards; vanadinite for Pb and Cl, pyrophanite
for Mn, synthetic MgO for Mg, sphalerite for S.