Admontite Mineral Data

General Admontite Information

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.

Name Pronunciation:

Admontite + Pronunciation

Synonym:

ICSD 34190

PDF 34-1438

Admontite Crystallography

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 - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.6(1), 2.68(0.9), 12.08(0.9),

Physical Properties of Admontite

Cleavage:

None

Color:

Colorless.

Density:

1.82 - 1.87, Average = 1.84

Diaphaneity:

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

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
Ncalc = 1.46 - 1.48

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

Electron Density:

Bulk Density (Electron Density)=1.89 gm/cc
note: Specific Gravity of Admontite =1.85 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Admontite= 0.45 barns/electron
U=PE_Admontite x rElectron Density= 0.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Admontite is Not Radioactive

Admontite Classification

Dana Class:

26.06.03.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.06)Dana Type

(26.06.03)Dana Group

26.06.03.01 Admontite MgB6O10•7(H2O) P 2₁/c 2/m

Strunz Class:

06.FA.15 06 - BORATES

06.F - Hexaborates

06.FA -Neso-hexaborates

06.FA.15 Admontite MgB6O10•7(H2O) P 2₁/c 2/m

Other Admontite Information

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 - 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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Print or Cut-and-Paste your Admontite Specimen Label here :

Admontite

MgB6O10•7(H2O)
Dana No: 26.06.03.01 Strunz No: 06.FA.15
Locality:

Notes:

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