Ferrotaaffeite-2N’2S

(Fe2+,Mg,Zn)3Al8BeO16
IMA status
  • Approved
IMA symbol
Ftf-2N'2S
IMA approved
2011
Also known as
  • Ferrotaaffeiet-2N’2S
  • Ferrotaaffeit-2N’2S
  • IMA2011-025

Where it forms, where it's found

Geological setting

Tin deposit outside of a granite contact

Type locality
Xianghualing Sn-polymetallic ore field
  1. Linwu Co.
  2. Chenzhou
  3. Hunan
  4. China

25.4667°, 112.5667°

1recorded occurrences
Source · OpenStreetMap

Safety & handling

Physical

Hardness
123456789108.5 – 9/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Transparency
Transparent
Colour
dark green to dark grey
Streak
white
Tenacity
brittle
Cleavage
Imperfect/Fair

(001)

Fracture
Conchoidal
Density
3.99 g/cm³

Optical

UV response
none

Crystallography

Crystal system
Hexagonal
Space group
#114
Cell parameters
a = 5.706(8) Å · c = 18.352(3) Å
Z
2
Type-locality form

tabular crystals to a size of about 100 μm

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen1615.999255.984
27.90%
13AlAluminiumAluminium826.982215.856
23.53%
30ZnZincZinc365.380196.140
21.38%
26FeIronIron355.845167.535
18.26%
12MgMagnesiumMagnesium324.30572.915
7.95%
4BeBerylliumBeryllium19.0129.012
0.98%
Total917.442100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • Ferrotaaffeiet-2N’2S
  • Ferrotaaffeit-2N’2S
  • IMA2011-025

In other languages

German
Ferrotaaffeit-2N'2S · IMA 2011-025
Italian
ferrotaaffeite-2N'2S

Classification

Strunz
10th ed.

4.FC.25

  • 4OxidesClass
  • 4.FHydroxides (without V or U)Division
  • 4.FCHydroxides with OH, without H2O; corner-sharing octahedraGroup
  • 4.FC.25Ferrotaaffeite-2N’2SSpecies

Group, growth & confusion

In the same group
1 members

Literature, links & citation

Citations
  1. 2011Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011, CNMNC Newsletter No. 10. Mineralogical Magazine, 75 (5) 2549-2561 doi:10.1180/minmag.2011.075.5.2549 DOI: 10.1180/minmag.2011.075.5.2549
  2. 2012Yang, Z., Ding, K., De Fourestier, J., Mao, Q., Li, H. (2012) Ferrotaaffeite-2N'2S, a new mineral species, and the crystal structure of Fe2+-rich magnesiotaaffeite-2N'2S from the Xianghualing tin-polymetallic ore field, Hunan Province, China. The Canadian Mineralogist, 50 (1) 21-29 doi:10.3749/canmin.50.1.21 DOI: 10.3749/canmin.50.1.21
  3. 2014(2014) Ferrotaaffeite-2N’2S. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Ferrotaaffeite-2N’2S — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/ferrotaaffeite-2n-2s-42821},
  note      = {Accessed 2026-05-11}
}