Achalaite

General
Category| Mineral
Formula
(repeating unit)| (Fe2+,Mn)(Ti,Fe3+,Ta)(Nb,Ta)2O8
Strunz classification| 4.D0.
Crystal system| Monoclinic
Unit cell| a = 9.422(4) [Å], b = 11.427(3) [Å]
c = 5.120(1) [Å]; β = 90.12°; Z = 4[1]
Identification
Color| Black
Crystal habit| fibrous
Mohs scale hardness| 5.5
|re|er}}| metallic
Streak| black
Specific gravity| 6.285
Density| 6.285 g/cm3
Pleochroism| Non-pleochroic
References| [1]

Achalaite ((Fe2+, Mn)(Ti, Fe3+, Ta)(Nb, Ta)2O8) is a black mineral of the wodginite group, first discovered in 2013.[3]

It crystallizes in the monoclinic system and has a dark, metallic luster, a specific gravity of 6.285 and a Mohs hardness of 5.5.[4]

Achalaite occurs in the intermediate zone of topaz- and tantalite-bearing pegmatite.[4] Associated minerals include rutile, quartz and albite.[1]

Its name comes from the type locality: the Achala batholith in Córdoba, Argentina and the mineral has been approved by the IMA with the acronym 2013-103.[1]

## References

1. ↑ 1.0 1.1 1.2 1.3 "Achalaite". https://www.mindat.org/min-46039.html&xid=17259,15700002,15700023,15700186,15700190,15700248,15700253&usg=ALkJrhj9c5wND8KGDHQ3SVqASuLqdByGIg. Retrieved 8 March 2019.
2. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
3. ↑ "The New IMA List of Minerals – A Work in Progress – Updated: July 2016". http://nrmima.nrm.se//IMA_Master_List_(2016-07).pdf. Retrieved 8 March 2019.
4. ↑ 4.0 4.1 "Achalaite Fe2+TiNb2O8". http://www.handbookofmineralogy.com/pdfs/achalaite.pdf. Retrieved 8 March 2019.

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