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Rivadavite

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Bernardino de la Trinidad Gónzalez Rivadavia y Rivadavia
Formula:
Na6Mg[B6O7(OH)6]4 · 10H2O
System:
Monoclinic
Colour:
colourless, white
Hardness:
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 Rivadavite

Approved 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
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http://www.mindat.org/min-3426.html
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First Recorded Occurrence of Rivadavite

Year of Discovery:
1966

Occurrences of Rivadavite

Geological Setting:
Sedimentary borate deposits, hot springs

Physical Properties of Rivadavite

Vitreous, Silky
Diaphaneity (Transparency):
Transparent
Comment:
Silky in aggregates
Colour:
colourless, white
Streak:
white
Hardness (Mohs):
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)

Crystallography of Rivadavite

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

Optical Data of Rivadavite

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 Rivadavite

Formula:
Na6Mg[B6O7(OH)6]4 · 10H2O
Essential elements:
All elements listed in formula:

Relationship of Rivadavite to other Species

Common Associates:
6.FA.05AksaiteMg[B6O7(OH)6] · 2H2O
6.FA.10McallisteriteMg2[B6O7(OH)6]2 · 9H2O
6.FA.15AdmontiteMg[B6O7(OH)6] · 4H2O
6.FA.25TeruggiteCa4Mg[AsO4|B6O7(OH)6]2 · 12H2O
9.2.1HambergiteBe2(BO3)(OH)
9.2.2SuaniteMg2[B2O5]
9.2.3KotoiteMg3[BO3]2
9.2.4SzaibélyiteMgBO2(OH)
9.2.5PreobrazhenskiteMg3B11O15(OH)9
9.2.6AksaiteMg[B6O7(OH)6] · 2H2O
9.2.7WightmaniteMg5(BO3)O(OH)5 · 2H2O
9.2.8PinnoiteMg[B2O(OH)6]
9.2.9KurnakoviteMgB3O3(OH)5 · 5H2O
9.2.10HalurgiteMg2[B4O7]2 · 5H2O
9.2.11InderiteMgB3O3(OH)5 · 5H2O
9.2.12HungchaoiteMg(B4O7) · 9H2O
9.2.13AdmontiteMg[B6O7(OH)6] · 4H2O
9.2.14McallisteriteMg2[B6O7(OH)6]2 · 9H2O
9.2.16KaliboriteKMg2H[B6O8(OH)5]2(H2O)4
9.2.17IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2O

Other Names for Rivadavite

Name in Other Languages:
German:Rivadavit
Spanish:Rivadavita

Other Information

Other Information:
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 Rivadavite

Reference List:
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 Rivadavite

Localities for Rivadavite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Argentina
 
  • Salta
    • 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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