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Formula: (Fe2+,Mg,Zn)3Al8BeO16
Oxide, taaffeite group,
beryllium-bearing mineral
Crystal system: Hexagonal
Specific gravity: 3.99 calculated
Hardness: 8½ to 9
Streak: White
Colour: Dark green to dark grey
Environments
Ferrotaaffeite-2N'2S is a rare mineral, approved in 2011 and to date (September 2025) reported only from the
type locality.
Localities
At the type locality, the Xianghualing Sn-polymetallic ore field, Linwu county, Chenzhou, Hunan, China, both
magnesium-rich ferrotaaffeite-2N'2S and Fe2+-rich
magnesiotaaffeite-2N'2S were found at the Xianghualing
tin mine. The ore deposits occur around
granite plutons and display obvious zoning in the products of
mineralisation. Ferrotaaffeite-2N'2S and Fe2+-rich
magnesiotaaffeite-2N'2S were found near the exocontact zone of a
granite body and in carbonate rocks; they formed during the
skarn stage. Associated minerals include
ferronigerite-2N1S,
cassiterite, liberite,
pyrite, sphalerite,
pyrrhotite, galena,
spinel and phlogopite
(CM 50.21-29).
Ferrotaaffeite-2N'2S from the Xianghualing
Mine - Image
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