Rivadavite Mineral Data + 
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- 26.6.1.1 Rivadavite Na6MgB24O40·22(H2O) P 21/c 2/m
- V/H.17-10 Admontite MgB6O10·7(H2O) P 21/c 2/m
- V/H.17-20 Mcallisterite Mg2B12O14(OH)12·9(H2O) R 3c 3 2/m
- V/H.17-30 Aksaite MgB6O7(OH)6·2(H2O) P bca 2/m 2/m 2/m
- V/H.17-40 Rivadavite Na6MgB24O40·22(H2O) P 21/c 2/m
General Rivadavite Information |
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 Chemical Formula: |
Na6MgB24O40·22(H2O) | ||
| 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 | |||
| Empirical Formula: |
Na6MgB24O40·22(H2O) | ||
| IMA Status: |
Approved IMA 1967 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Synonym: |
ICSD 31455 | ||
| PDF 19-1211 | |||
Rivadavite Image | |||
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Images:
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Rivadavite Crystallography |
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| Axial Ratios: |
a:b:c =1.845:1:1.3892 | ||
| Cell Dimensions: |
a = 14.779, b = 8.01, c = 11.128, Z = 1; beta = 105.9° V = 1,266.93 Den(Calc)= 1.91 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 7.59(1), 14.2(1), 2.95(0.66), | ||
Physical Properties of Rivadavite |
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| Cleavage: |
[100] Perfect, [101] Perfect, [010] Indistinct | ||
| Color: |
Colorless, White. | ||
| Density: |
1.905 | ||
| Diaphaniety: |
Transparent | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Hardness: |
3.5 - Copper Penny | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Rivadavite |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=1.93 gm/cc |
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| Fermion Index |
Fermion Index = 0.0374 Boson Index = 0.9626 |
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| Photoelectric: |
PERivadavite = 0.47 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Rivadavite is Not Radioactive |
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Rivadavite Classification |
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| Dana Class: |
26.6.1.1 (26)Hydrated Borates Containing Hydroxyl or Halogen | ||
| (26.6)Dana Type | |||
| (26.6.1)Dana Group | |||
| Strunz Class: |
V/H.17-40 V - Nitrates, Carbonates and Borates | ||
| V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2- | |||
| V/H.17 - Admontite - Rivadavite series | |||
Other Rivadavite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Rivadavite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Rivadavite using: Visit our Advertisers for Rivadavite : Translate Rivadavite Mineral Data : Ask about Rivadavite here : Print or Cut-and-Paste your Rivadavite Specimen Label here :
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