May 22 2014
Bogvadite was first found in Ivigtut, Greenland in 1988. It was named after Richard Bogvad, former chief geologist of the company Oresund A/S, which mined the Ivigtut cryolite deposit.
Properties of Bogvadite
The following are the key properties of Bogvadite:
- Cell Data
- Space Group: Pnmn or Pn2n
- a = 7.110(3)
- b = 19.907(10)
- c = 5.347(3)
- Z = 2
- Crystal Data
- Orthorhombic
- Point Group: 2/m 2/m 2/m or mm2
- As blocky crystals, to 0.15mm, showing {110}, {010}, and {012}, slightly flattened on {010} and elongated || [100], with rounded and corroded faces
- X-ray Powder Pattern - 3.240 (100), 3.194 (50), 2.924 (50), 2.116 (50), 9.968 (40), 6.689 (40), 2.668 (40)
- Chemical Composition
| Elements |
Content 1 |
Content 2 |
| F |
42.85 |
42.40 |
| Ba |
32.17 |
30.65 |
| Al |
12.45 |
12.04 |
| Sr |
7.03 |
9.78 |
| Na |
5.57 |
5.13 |
| Total |
98.10 |
98 |
- Optical Properties
- Optical Class: Biaxial (–)
- Orientation: X = c; Y = a; Z = b
- α = 1.4326(2)
- β = 1.4360(2)
- γ = 1.4389(2)
- 2V(meas.) = 87(0.5)°
- 2V(calc.) = 85(6)°
- Estimated Properties
| Electron density |
Bulk density (electron density) = 3.54 g/cm3
note: Specific gravity of Bogvadite = 3.93 g/cm3 |
| Photoelectric |
PEBogvadite = 148.38 barns/electron
U= PEBogvadite x ρElectron density = 525.76 barns/cm3 |
| Fermion index |
Fermion index = 0.06
Boson index = 0.94 |
Radioactivity
|
Bogvadite is not radioactive
|
How to Identify Bogvadite
Bogvadite is a colorless, non-fluorescent mineral, having a vitreous luster, white streak, and transparent appearance. Its fractures are uneven, and it is formed as blocks.
The density of bogvadite is 3.85 g/cm3, and its relative hardness is 4.
Global Distribution
Bogvadite is largely distributed in the Ivigtut cryolite deposit, southwestern Greenland.
Occurrence of Bogvadite and Useful Mineral Association
Bogvadite occurs in the cryolite deposit. It is closely associated with quartz, potassian mica, barite, ralstonite, and jarlite.
References