Series: Forms a continuous series with grandidierite. Occurrence: In porphyritic granite and granodiorite...dumortierite, schorl, zircon, ilmenite, apatite, monazite, pyrite (Japan); grandidierite, werdingite, boralsilite...Ominelite, (Fe,Mg)Al3BSiO9 (Fe2+ analogue of grandidierite), a new mineral from porphyritic granite in...Škoda (2010) Crystal chemistry and origin of grandidierite, ominelite, boralsilite, and werdingite from...substitution on the crystal structures of the grandidierite-ominelite series. Amer. Mineral., 92, 863872 |