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Aristarainite

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Formula:
Na2MgB12O20 · 8H2O
Colour:
Colourless, white
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.027
Crystal System:
Monoclinic
Name:
For Argentine mineralogist Lorenzo Francisco Aristarain (1926-2013), who specialized in borate deposits, La Plata University, Buenos Aires, Argentina.
This page provides mineralogical data about Aristarainite.


Hide all sections | Show all sections

Classification of AristarainiteHide

Approved
Approval Year:
1973
6.FB.05

6 : BORATES
F : Hexaborates
B : Ino-hexaborates
26.6.5.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
9.1.12

9 : Borates
1 : Borates of the alkalis and boric acid

Physical Properties of AristarainiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, white
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}{100}
Fair {110}
Fracture:
Splintery
Density:
2.027(5) g/cm3 (Measured)    2.005 g/cm3 (Calculated)

Optical Data of AristarainiteHide

Type:
Biaxial (+)
RI values:
nα = 1.484 nβ = 1.498 nγ = 1.523
2V:
Measured: 70° , Calculated: 76°
Max Birefringence:
δ = 0.039
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v to r < v strong

Chemical Properties of AristarainiteHide

Formula:
Na2MgB12O20 · 8H2O
IMA Formula:
Na2Mg[B6O8(OH)4]2 · 4H2O

Crystallography of AristarainiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 18.886 Å, b = 7.521 Å, c = 7.815 Å
β = 97.73°
Ratio:
a:b:c = 2.511 : 1 : 1.039
Unit Cell V:
1,099.97 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular or elongated crystals on [010], rosette aggregates, crusts. Common forms: {001},{100}, {110}, less common: {210}, {201}, {-4o1}, {211} and{-211}

Type Occurrence of AristarainiteHide

General Appearance of Type Material:
Small crystals up to 0.3mm in length, and 0.05 by 0.05 in cross section.
Place of Conservation of Type Material:
Smithsonian 136046
Geological Setting of Type Material:
Playa evaporite
Associated Minerals at Type Locality:

Synonyms of AristarainiteHide

Other Language Names for AristarainiteHide

Related Minerals - Nickel-Strunz GroupingHide

6.FB.10KaliboriteKMg2H[B6O8(OH)5]2(H2O)4Mon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.1.1SassoliteH3BO3Tric. 1 : P1
9.1.2MetaboriteHBO2Iso.
9.1.3DiomigniteLi2[B4O7]Tet.
9.1.4BiringucciteNa2B5O8(OH) · H2OMon.
9.1.5NasiniteNa2[B5O8(OH)] · 2H2OOrth.
9.1.6KerniteNa2[B4O6(OH)2] · 3H2OMon. 2/m : P2/b
9.1.7EzcurriteNa4B10O17 · 7H2OTric. 1 : P1
9.1.8TincalconiteNa2(B4O7) · 5H2OTrig. 3 2 : R3 2
9.1.9BoraxNa2(B4O5)(OH)4 · 8H2OMon. 2/m : B2/b
9.1.10AmeghiniteNa(H4B3O7)Mon.
9.1.11SborgiteNa[B5O6(OH)4] · 3H2OMon.
9.1.13SantiteK[B5O6(OH)4] · 2H2OOrth.
9.1.14Larderellite(NH4)B5O7(OH)2 · H2OMon.
9.1.15Ammonioborite(NH4)2[B5O6(OH)4]2 · H2OMon. 2/m : B2/b
9.1.16Rhodizite(K,Cs)Al4Be4(B,Be)12O28Iso. 4 3m : P4 3m

Fluorescence of AristarainiteHide

Moderate cream white in SW, weakly phosphorescent.

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 AristarainiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hurlbut, C.S., Erd, R.C. (1974) Aristarainite, Na2O∙MgO∙6B2O3∙10H2O, a new Mineral from Salta, Argentina. American Mineralogist: 59: 647-651.
Ghose, S., Wan, C. (1977) Aristarainite: Na2Mg[B6O8(OH)4]2·4H2O: a sheet structure with chains of hexaborate polyanions. American Mineralogist: 62: 979-989.

Internet Links for AristarainiteHide

Localities for AristarainiteHide

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)
 
  • Salta
    • Los Andes department
      • Salar del Hombre Muerto
Amer.Min.(1974) 59, 647-651; Alonso, R. N. (1999). On the origin of La Puna borates. Acta geológica hispánica, 34(2), 141-166.; CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, 9:1-27.
Turkey
 
  • Aegean Region
    • Kütahya Province
      • Emet
        • Doğanlar village
J. García-Veigas, L. Rosell, X. Alcobé, I. Subias, F. Ortí, I. Gündogan and C. Helvaci (2010) Fontarnauite, a New Sulphate-Borate Mineral from the Emet Borate District (Turkey). Macla 13, 97-98.
USA
 
  • California
    • Inyo Co.
      • Death Valley
Econ Geol (1996) 91:622-635
      • Furnace Creek District (Furnace Creek Borate District; Death Valley Area Borate Deposits; Ryan area)
        • Twenty Mule Team Canyon
Am Min 64:3-4 pp 369-375; Erd, R.C., J.F. McAllister, and G.D. Eberlein (1979) New data on hungchaoite, the second world occurrence, Death Valley region, California. American Mineralogist: 64: 369-375.
Mineral and/or Locality  
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