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Rivadavite Mineral Data

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General Rivadavite Information

Help on Chemical  Formula: Chemical Formula: Na6MgB24O40•22(H2O)
Help on Composition: Composition: Molecular Weight = 1,458.00 gm
   Sodium      9.46 %  Na   12.75 % Na2O
   Magnesium   1.67 %  Mg    2.76 % MgO
   Boron      17.79 %  B    57.30 % B2O3
   Hydrogen    3.04 %  H    27.18 % H2O
   Oxygen     68.04 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na6MgB24O40•22(H2O)
Help on Environment: Environment: Sedimentary borate deposits; deposited from borate-rich hot springs.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Tincalayu borax deposit, Salar del Hombre Muerto, Salta Province, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Bernardino Rivadavia (1780-1845), first President of the Argentine Republic.
Help on Name Pronunciation: Name Pronunciation: Rivadavite + Pronunciation Say RIVADAVITE
Help on Synonym: Synonym: ICSD 31455
  PDF 19-1211

Rivadavite Image

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Comments: Translucent white rivadavite nodule with some adhering earthy material.
Location: Tincalayu, Salta Province, Argentina. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rivadavite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.845:1:1.3892
Help on Cell Dimensions: Cell Dimensions: a = 14.779, b = 8.01, c = 11.128, Z = 1; beta = 105.9° V = 1,266.93 Den(Calc)= 1.91
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.59(1), 14.2(1), 2.95(0.66),

Physical Properties of Rivadavite

Help on Cleavage: Cleavage: {100} Perfect, {101} Perfect, {010} Indistinct
Help on Color: Color: Colorless, White.
Help on Density: Density: 1.905
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Rivadavite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2527,KPDmeas= 0.2534,KC= 0.2454
Ncalc = 1.47
Help on Optical Data: Optical Data: Biaxial (+), a=1.47, b=1.481, g=1.497, bire=0.0270, 2V(Calc)=82, 2V(Meas)=80.

Calculated Properties of Rivadavite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.93 gm/cc
note: Specific Gravity of Rivadavite =1.91 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PERivadavite = 0.47 barns/electron
U=PERivadavite x rElectron Density= 0.91 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rivadavite is Not Radioactive

Rivadavite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.06)Dana Type
  (26.06.01)Dana Group Rivadavite Na6MgB24O40•22(H2O) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 06.FA.20 06 - BORATES
  06.F - Hexaborates
  06.FA -Neso-hexaborates
06.FA.20 Rivadavite Na6MgB24O40•22(H2O) P 21/c 2/m

Other Rivadavite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Rivadavite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 06.FA.20





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