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Achalaite

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Formula:
(Fe2+,Mn)(Ti,Fe3+,Ta)(Nb,Ta)2O8
Colour:
Black
Lustre:
Metallic
Hardness:
Specific Gravity:
6.285 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
After the type locality, the Achala granite batholith, located in Córdoba, Argentina
Achalaite is the first member of the wodginite group with Nb dominant over Ta; it is genetically considered a post-magmatic phase.


Hide all sections | Show all sections

Classification of AchalaiteHide

Approved
Approval Year:
2013
First Published:
2016
4.D0.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
0 :

Physical Properties of AchalaiteHide

Metallic
Colour:
Black
Streak:
Black
Hardness:
5½ on Mohs scale
Cleavage:
None Observed
Appears to lack cleavage
Density:
6.285 g/cm3 (Calculated)

Optical Data of AchalaiteHide

Type:
Anisotropic
Anisotropism:
Weak in air, particularly noticeable along grain boundaries; in oil, it is medium with light to intermediate olive grey tint
Bireflectance:
Weak but noticeable
Reflectivity:
470nmR1=16.89%R2= 17.72%
470nmR1=5.26%R2= 5.76%
546nmR1=16.49%R2= 17.26%
546nmR1=4.98%R2= 5.32%
589nmR1=16.34%R2= 17.04%
589nmR1=4.97%R2= 5.26%
650nmR1=16.23%R2= 16.94%
650nmR1=4.86%R2= 5.19%
nmR1=%R2=%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 17.72%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Light grey with a slightly violet tint in air, and light grey with an olive tint in oil
Internal Reflections:
Have not been observed
Pleochroism:
Non-pleochroic
Comments:
not observed

Chemical Properties of AchalaiteHide

Formula:
(Fe2+,Mn)(Ti,Fe3+,Ta)(Nb,Ta)2O8
IMA Formula:
Fe2+TiNb2O8

Crystallography of AchalaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 9.422(4) Å, b = 11.427(3) Å, c = 5.120(1) Å
β = 90.12(4)°
Ratio:
a:b:c = 0.825 : 1 : 0.448
Unit Cell V:
551.2 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.630Å(40)
2.964Å(100)
2.564Å(35)
2.493Å(40)
1.766Å(35)
1.735Å(40)
1.711Å(50)
1.453Å(40)
Comments:
From Type Description.

Type Occurrence of AchalaiteHide

General Appearance of Type Material:
As polygranular aggregates up to 1.5 cm across, included in albite
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museo de Mineralogiá y Geologiá ‘‘Dr. Alfred Stelzner’’, Universidad Nacional de Córdoba, Córdoba, Argentina, catalogue number 3279
Empirical Formula of Type Material:
(Fe2+2.211Mn1.524Fe3+0.226U0.030Ca0.0094.000(Ti1.819Fe3+0.920Ta0.579Sn0.533Zr0.1504.000(Nb4.781Ta3.000W0.2198.000O32
Chemical Analysis of Type Material:
WO32.41 %
Nb2O530.18 %
Ta2O537.56 %
TiO26.90 %
ZrO20.88 %
SnO23.82 %
Fe2O34.35 %
FeO7.54 %
MnO5.14 %
CaO0.02 %
UO20.38 %
Total:99.18 %
Associated Minerals at Type Locality:
Reference:
Galliski, M. Á., Márquez-Zavalía, M. F., Černý, P., Lira, R., Colombo, F., Roberts, A. C., Bernhardt, H. J. (2016) Achalaite, Fe2+TiNb2O8, a new member of the wodginite group from the La Calandria granitic pegmatite, Córdoba, Argentina. The Canadian Mineralogist 54: 1043-1052

Synonyms of AchalaiteHide

Relationship of Achalaite to other SpeciesHide

Member of:
Other Members of this group:
FerrotitanowodginiteFe2+TiTa2O8Mon.
FerrowodginiteFe2+Sn4+Ta2O8Mon.
LithiotantiteLiTa3O8Mon.
LithiowodginiteLiTa3O8Mon.
Tantalowodginite(Mn2+0.50.5)TaTa2O8Mon. 2/m : B2/b
TitanowodginiteMn2+TiTa2O8Mon.
WodginiteMn2+Sn4+Ta2O8Mon.

Related Minerals - Nickel-Strunz GroupingHide

4.D0.AkaogiiteTiO2Mon. 2/m : P21/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AchalaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Galliski, M.á ., Márquez-Zavaliá, M.F., Černý, P., Lira, R., Roberts, A.C. and Bernhardt, H.-J. (2014) Achalaite, IMA 2013-103. CNMNC Newsletter No. 19, February 2014, page 166; Mineralogical Magazine, 78, 165-170
Galliski, M. Á., Márquez-Zavalía, M. F., Černý, P., Lira, R., Colombo, F., Roberts, A. C., Bernhardt, H. J. (2016) Achalaite, Fe2+TiNb2O8, a new member of the wodginite group from the La Calandria granitic pegmatite, Córdoba, Argentina. The Canadian Mineralogist 54: 1043-1052

Internet Links for AchalaiteHide

Localities for AchalaiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina (TL)
 
  • Córdoba Province
    • Pocho department
      • San Gerónimo
        • Cañada del Puerto
Galliski, M. Á., Márquez-Zavalía, M. F., Černý, P., Lira, R., Colombo, F., Roberts, A. C., & Bernhardt, H. J. (2016). Achalaite, Fe2+ TiNb2O8, A New Member of the Wodginite Group From the La Calandria Granitic Pegmatite, Córdoba, Argentina. The Canadian Mineralogist, 54(4), 1043-1052.
 
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