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Aksaite

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About AksaiteHide

Formula:
Mg[B6O7(OH)6] · 2H2O
Colour:
Colorless, white to pale gray
Hardness:
Specific Gravity:
2.066
Crystal System:
Orthorhombic
Name:
Named after its discovery locality in Kazakhstan.
This page provides mineralogical data about Aksaite.


Classification of AksaiteHide

Approved
6.FA.05

6 : BORATES
F : Hexaborates
A : Neso-hexaborates
26.6.4.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
9.2.6

9 : Borates
2 : Borates of Be and Mg

Physical Properties of AksaiteHide

Transparency:
Transparent, Translucent
Colour:
Colorless, white to pale gray
Streak:
white
Hardness:
2½ on Mohs scale
Cleavage:
Distinct/Good
Probable on {100} and {010} .
Density:
2.066 g/cm3 (Measured)    1.972 g/cm3 (Calculated)

Optical Data of AksaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.473(1) nβ = 1.508(1) nγ = 1.528(1)
2V:
Measured: 88° , Calculated: 78°
Max Birefringence:
δ = 0.055
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none

Chemical Properties of AksaiteHide

Formula:
Mg[B6O7(OH)6] · 2H2O
IMA Formula:
MgB6O7(OH)6 · 2H2O

Crystallography of AksaiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Cell Parameters:
a = 12.54 Å, b = 24.35 Å, c = 7.48 Å
Ratio:
a:b:c = 0.515 : 1 : 0.307
Unit Cell V:
2,284.01 ų (Calculated from Unit Cell)
Morphology:
Crystals are elongated along [001] and flattened {100} , with {100} , {010} , {021} and rarely {001} , to 1.5 cm; prism faces are striated parallel to [100] .
Comment:
On synthetic material.

Type Occurrence of AksaiteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 160056.
Geological Setting of Type Material:
In fine-grained halite in a salt dome.
Associated Minerals at Type Locality:

Other Language Names for AksaiteHide

German:Aksait
Russian:Аксаит
Spanish:Aksaita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Halite1 photo of Aksaite associated with Halite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.FA.10McallisteriteMg2[B6O7(OH)6]2 · 9H2OTrig. 3m (3 2/m) : R3c
6.FA.15AdmontiteMgB6O10 · 7H2OMon.
6.FA.20RivadaviteNa6Mg[B6O7(OH)6]4 · 10H2OMon. 2/m : P21/m
6.FA.25TeruggiteCa4Mg[AsO4|B6O7(OH)6]2 · 12H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.2.1HambergiteBe2(BO3)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.2.2SuaniteMg2[B2O5]Mon.
9.2.3KotoiteMg3[BO3]2Orth. mmm (2/m 2/m 2/m) : Pnnm
9.2.4SzaibélyiteMgBO2(OH)Mon.
9.2.5PreobrazhenskiteMg3B11O15(OH)9Orth.
9.2.7WightmaniteMg5(BO3)O(OH)5 · 2H2OMon.
9.2.8PinnoiteMg[B2O(OH)6]Tet. 4/m : P42/m
9.2.9KurnakoviteMgB3O3(OH)5 · 5H2OTric. 1 : P1
9.2.10HalurgiteMg2[B4O7]2 · 5H2OMon.
9.2.11InderiteMgB3O3(OH)5 · 5H2OMon. 2/m : P21/b
9.2.12HungchaoiteMg(B4O7) · 9H2OTric. 1
9.2.13AdmontiteMgB6O10 · 7H2OMon.
9.2.14McallisteriteMg2[B6O7(OH)6]2 · 9H2OTrig. 3m (3 2/m) : R3c
9.2.15RivadaviteNa6Mg[B6O7(OH)6]4 · 10H2OMon. 2/m : P21/m
9.2.16KaliboriteKMg2H[B6O8(OH)5]2(H2O)4Mon. 2/m : B2/b
9.2.17IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2OHex.

Other InformationHide

Thermal Behaviour:
Chelkar salt dome material [cm-1]: 3620, 3560w, 3410sh, 3350, 3310sh, 3215, 3120, 2490w, 1656, 1482, 1431s, 1388s, 1365s, 1344s, 1248s, 1198, 1158, 1121s, 1045, 1028, 1005sh, 957, 902, 856, 816, 735, 690, 637w, 600sh, 532w, 457w
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 AksaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Blazko, L.N., Kondrat’eva, V.V., Yarzhemskii, Y.Y. (1962) Aksaite, a new hydrous magnesium borate. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 91(4): 447-454.
Fleischer, M. (1963) New mineral names. American Mineralogist: 48: 209-217.
Clark, J.R., Erd, R.C. (1963) The probable chemical formula of aksaite, a new hydrated magnesium borate. American Mineralogist: 48: 930-935.
Dal Negro, A., Ungaretti, L., Sabelli, C. (1971) The crystal structure of aksaite. American Mineralogist: 56: 1553-1566.
Chukanov, N.V. (2014): Infrared spectra of mineral species: Extended library. Springer (Springer Geochemistry/Mineralogy), vol. 1, Dordrecht, 1726 pp.

Internet Links for AksaiteHide

Localities for AksaiteHide

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.
Kazakhstan (TL)
 
  • Aktobe
    • Aksai Valley
[Clark, 1993 - "Hey's Mineral Index, 3rd Edition"]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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