Jun 12 2014
Admontite was named after Admont in Austria, the place where the mineral was initially discovered, near the original locality.
Properties of Admontite
The following are the key properties of admontite:
- Cell Data
- Space group: P21/c.
- a = 12.68(2)
- b = 10.07(2)
- c = 11.32(2)
- β = 109.68(10)°
- Z = 4
- Crystal Data
- Monoclinic
- Point group: 2/m
- Poorly developed or corroded, to about 1mm
- Elongated along [001], flattened parallel to {100}
- X-ray powder pattern: 7.60 (10vb), 12.08 (9), 2.68 (9), 3.93 (8), 5.29 (7), 3.09 (6), 5.72 (4)
- Chemical Composition
| Elements |
Content 1 |
Content 2 |
| B2O3 |
[54.50] |
55.66 |
| MgO |
10.20 |
10.74 |
| H2O |
35.30 |
33.60 |
| Total |
[100.00] |
100.00 |
- Optical Properties
- Optical class: Biaxial (-)
- Orientation: X ^ c ~ 45°; Y = b
- Dispersion: r < v
- α = 1.442(2); β = [1.500]; γ = 1.504(2)
- 2V(meas.) = ~ 30°
- Estimated Properties
| Electron density |
Bulk density (electron density) = 1.89 g/cm3
note: Specific gravity of Admontite = 1.85 g/cm3 |
| Photoelectric |
PEAdmontite = 0.45 barns/electron
U = PEAdmontite x ρelectron density = 0.85 barns/cm3 |
| Fermion index |
Fermion index = 0.04
Boson index = 0.96 |
Radioactivity
|
Admontite is not radioactive
|
How to Identify Admontite
Admontite is colorless and transparent with no cleavage. This mineral has a white streak. The fracture on this mineral is conchoidal. It has non-fluorescent luminescence.
The density of admontite is 1.82 to 1.87 g/cm3, with a hardness of 2 to 3 - between gypsum and calcite.
Global Distribution
Admontite is distributed mainly in Schildmauer, near Admont, Styria, Austria.
Occurrence of Admontite and Useful Mineral Association
Admontite occurs in gypsum deposits.
It is often associated with minerals such as gypsum, hexahydrite, loweite, anhydrite, pyrite, eugsterite, and quartz.
References