| Achalaite | |
|---|---|
| General | |
| Category | Mineral |
| Formula (repeating unit) | (Fe2+,Mn)(Ti,Fe3+,Ta)(Nb,Ta)2O8 |
| IMA symbol | Ahl[1] |
| 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[2] |
| Identification | |
| Color | Black |
| Crystal habit | fibrous |
| Mohs scale hardness | 5.5 |
| Luster | metallic |
| Streak | black |
| Specific gravity | 6.285 |
| Density | 6.285 g/cm3 |
| Pleochroism | Non-pleochroic |
| References | [2] |
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.[2]
Its name comes from the type locality: the Achala batholithinCórdoba, Argentina and the mineral has been approved by the IMA with the acronym 2013-103.[2]
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