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Rivadavite

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About RivadaviteHide

Bernardino de la Trinidad Gónzalez Rivadavia y Rivadavia
Formula:
Na6Mg[B6O7(OH)6]4 · 10H2O
Colour:
colourless, white
Lustre:
Vitreous, Silky
Hardness:
Specific Gravity:
1.905
Crystal System:
Monoclinic
Name:
For Argentine president Bernardino Rivadavia (1780-1845). (Note that this has nothing to do with the Rivadavia borate mine.)
This page provides mineralogical data about Rivadavite.


Classification of RivadaviteHide

Approved
Approval Year:
1966
6.FA.20

6 : BORATES
F : Hexaborates
A : Neso-hexaborates
26.6.1.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
9.2.15

9 : Borates
2 : Borates of Be and Mg

Pronounciation of RivadaviteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of RivadaviteHide

Vitreous, Silky
Transparency:
Transparent
Comment:
Silky in aggregates
Colour:
colourless, white
Streak:
white
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {100} {-102}
poor on {010}
Fracture:
Splintery
Density:
1.905(2) g/cm3 (Measured)    1.91 g/cm3 (Calculated)

Optical Data of RivadaviteHide

Type:
Biaxial (+)
RI values:
nα = 1.470 nβ = 1.481 nγ = 1.497
2V:
Measured: 80° , Calculated: 82°
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively weak r > v

Chemical Properties of RivadaviteHide

Formula:
Na6Mg[B6O7(OH)6]4 · 10H2O

Crystallography of RivadaviteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 15.870 Å, b = 8.010 Å, c = 22.256 Å
β = 116.40°
Ratio:
a:b:c = 1.981 : 1 : 2.779
Unit Cell V:
2,534.11 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Elongated crystals in subparallel massive aggregates

Type Occurrence of RivadaviteHide

Synonyms of RivadaviteHide

Other Language Names for RivadaviteHide

German:Rivadavit
Spanish:Rivadavita

Common AssociatesHide

BoraxNa2(B4O5)(OH)4 · 8H2O
TincalconiteNa2(B4O7) · 5H2O

Related Minerals - Nickel-Strunz GroupingHide

6.FA.05AksaiteMg[B6O7(OH)6] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
6.FA.10McallisteriteMg2[B6O7(OH)6]2 · 9H2OTrig. 3m (3 2/m) : R3c
6.FA.15AdmontiteMgB6O10 · 7H2OMon.
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.
9.2.6AksaiteMg[B6O7(OH)6] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
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
9.2.16KaliboriteKMg2H[B6O8(OH)5]2(H2O)4Mon. 2/m : B2/b
9.2.17IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2OHex.

Other InformationHide

Notes:
Soluble in water
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 RivadaviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1967): 52: 326-335.
Nature: 60: 350.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for RivadaviteHide

Localities for RivadaviteHide

ⓘ - 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.(1967) 52, 326-336; Am Min 58:308-313; 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
 
  • Marmara Region
    • Balikesir Province
      • Bigadiç
CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, Vol. 9, 2000, pp. 1-27
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)
        • Ryan
American Mineralogist: 55: 349-357; 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; www.mineralsocal.org.
Mineral and/or Locality  
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