Multiple oxide, taaffeite group
Specific gravity: 3.99 calculated
Hardness: 8½ to 9
Colour: Dark green to dark grey
Ferrotaaffeite-2N'2S is a rare mineral, to date (February 2022) found only at the type locality.
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).
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