Oct 11 2013
Calcioancylite-(Nd) is a member of the ancylite group of minerals. The mineral was first discovered in 1991 from the Baveno, Piedmont, Italy.
It was named after the Greek word for “curved” and the presence of large amount of neodymium.
Properties of Calcioancylite-(Nd)
The following are the key properties of Calcioancylite-(Nd):
- Cell Data
- Space Group: Pm
- a = 7.212(2)
- b = 4.976(2)
- c = 8.468(2)
- β = 90.04(3)°
- Z = 1
- Crystal Data
- Monoclinic, pseudo-orthorhombic
- Point Group: m. As dipyramidal tabular crystals, to 1 mm, typically in subparallel aggregates
- X-ray Powder Pattern: 4.26 (10), 2.905 (9), 2.048 (8), 3.67 (7), 2.320 (7), 1.979 (7), 5.49 (6)
- Chemical Composition
| Elements |
Content |
| CO2 |
23.47 |
| Nd2O3 |
20.23 |
| Ce2O3 |
14.18 |
| CaO |
9.05 |
| Sm2O3 |
7.63 |
| Gd2O3 |
6.68 |
| H2O |
5.87 |
| Y2O3 |
3.93 |
| Pr2O3 |
3.23 |
| La2O3 |
3.16 |
| Dy2O3 |
1.74 |
| Tm2O3 |
0.83 |
| Total |
100 |
- Optical Properties
- Optical Class: Biaxial (–)
- Orientation: Z = c
- Dispersion: r < v, weak
- α = 1.660(1)
- β = 1.725(1)
- γ = 1.765(1)
- 2V(meas.) = 70°
- 2V(calc.) = 74°
- Estimated Properties
| Electron density |
Bulk density (electron density)=3.48 g/cm3
note: Specific gravity of Calcioancylite-(Nd) =3.71 g/cm3 |
| Photoelectric |
PECalcioancylite-(Nd) = 239.41 barns/electron
U= PECalcioancylite-(Nd) x ρ Electron density= 832.32 barns/cm3 |
| Fermion index |
Fermion index = 0.08
Boson index = 0.92 |
| Radioactivity |
Calcioancylite-(Nd) is radioactive |
How to Identify Calcioancylite-(Nd)
Calcioancylite-(Nd) is a pink mineral with a transparent appearance and vitreous luster. The hardness range of the mineral is 4 to 4.5.
Global Distribution
Calcioancylite-(Nd) is widely distributed in the Montecatini quarry, Baveno, Piedmont, Italy.
Occurrence of Calcioancylite-(Nd) and Useful Mineral Association
Calcioancylite-(Nd) occurs as coating miarolitic cavities in granite. It is closely associated with albite, quartz and orthoclase.
References