Magnesiotaaffeite comprises two minerals:
Magnesiotaaffeite-2N'2S: Mg3BeAl8O16, and
Magnesiotaaffeite-6N'3S Mg2BeAl6O12
Multiple oxides, beryllium-bearing minerals
Specific gravity: 3.62
Hardness: 8 to 8½
Streak: White
Colour: Pale olive-green; in thin section, nearly colourless

Metamorphic environments


At "Zircon Point" pegmatite, Khmara Bay, Casey Bay, Napier Complex, Enderby Land, Eastern Antarctica, Antarctica, magnesiotaaffeite was found in a pegmatite cutting granulite. Associated minerals include quartz, sillimanite, garnet, biotite, surinamite and sapphirine (HOM).

At the Ernabella Mission, Musgrave Ranges, North West Province, South Australia, magnesiotaaffeite was found in a nodule, perhaps formerly a corundum crystal, in high-grade metamorphosed picrite, associated with metamorphosed peridotite and granulite. Associated minerals include spinel, sapphirine and phlogopite (HOM).

At Stubenberg Quarry, Stubenberg am See, Hartberg-Fürstenfeld District, Styria, Austria, pseudosinhalite and magnesiotaaffeite occur as replacement products of spinel in geikieliteilmenitebaddeleyitezirconolite veins within polymetamorphic dolomite marble. The crystallisation sequence of magnesium-aluminium phases is spinelpseudosinhalitemagnesiotaaffeite minerals, and spinel formed after or during the replacement of baddeleyite by zirconolite (CM 46.1195-1205).

At the Xianghualing Sn-polymetallic ore field, Linwu county, Chenzhou, Hunan, China, ferrotaaffeite was found associated with Fe2+ rich magnesiotaaffeite, ferronigerite, cassiterite, liberite, pyrite, sphalerite, pyrrhotite, galena, spinel and phlogopite (CM 50.21-29).

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