Admontite Mineral Data + 
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- 26.6.3.1 Admontite MgB6O10·7(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 Admontite Information |
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 Chemical Formula: |
MgB6O10·7(H2O) | ||
| Composition: |
Molecular Weight = 375.27 gm | ||
| Magnesium 6.48 % Mg 10.74 % MgO | |||
| Boron 17.28 % B 55.66 % B2O3 | |||
| Hydrogen 3.76 % H 33.60 % H2O | |||
| Oxygen 72.48 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Mg(B6O10)·7(H2O) | ||
| Environment: |
In a gypsum deposit. | ||
| IMA Status: |
Approved IMA 1979 | ||
| Locality: |
Austria, Schidmaur, near Admont Link to MinDat.org Location Data. | ||
| Name Origin: |
For Admont, Austria, near the original locality. | ||
| Synonym: |
ICSD 34190 | ||
| PDF 34-1438 | |||
Search for Admontite Images | |||
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Images:
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Admontite Crystallography |
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| Axial Ratios: |
a:b:c =1.2591:1:1.1241 | ||
| Cell Dimensions: |
a = 12.68, b = 10.07, c = 11.32, Z = 4; beta = 109.68° V = 1,360.99 Den(Calc)= 1.83 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 7.6(1), 2.68(0.9), 12.08(0.9), | ||
Physical Properties of Admontite |
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| Cleavage: |
None | ||
| Color: |
Colorless. | ||
| Density: |
1.82 - 1.87, Average = 1.84 | ||
| Diaphaniety: |
Transparent | ||
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
| Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. | ||
| Hardness: |
2-3 - Gypsum-Calcite | ||
| Luminescence: |
Non-fluorescent. | ||
| Streak: |
white | ||
Optical Properties of Admontite |
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| Gladstone-Dale: |
CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2585,KPDmeas= 0.2564,KC= 0.2554 |
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| Optical Data: |
Biaxial (-), a=1.442, g=1.504, bire=0.0620 | ||
| Pleochroism (x): |
colorless. | ||
| Pleochroism (y): |
colorless. | ||
| Pleochroism (z): |
colorless. | ||
Calculated Properties of Admontite |
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| Electron Density: |
relectron=1.89 gm/cc |
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| Fermion Index |
Fermion Index = 0.04122 Boson Index = 0.95878 |
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| Photoelectric: |
PEAdmontite = 0.45 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Admontite is Not Radioactive |
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Admontite Classification |
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| Dana Class: |
26.6.3.1 (26)Hydrated Borates Containing Hydroxyl or Halogen | ||
| (26.6)Dana Type | |||
| (26.6.3)Dana Group | |||
| Strunz Class: |
V/H.17-10 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 Admontite Information |
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| References: |
NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Admontite : 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 Admontite using: Visit our Advertisers for Admontite : Translate Admontite Mineral Data : Ask about Admontite here : Print or Cut-and-Paste your Admontite Specimen Label here :
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