Log In
Chevkinite Group
A group of related mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Chevkinite Group
Group of complex and difficult-to-distinguish titanosilicates.
The chevkinite group may be subdivided in members with a monoclinic angle beta of ~100°, and members with beta ~113° ("perrierite group"). Unambiguous identification is often only possible using single-crystal diffraction methods (powder diffraction patterns are very similar).
A larger number of synthetic members have been prepared.
The chevkinite group may be subdivided in members with a monoclinic angle beta of ~100°, and members with beta ~113° ("perrierite group"). Unambiguous identification is often only possible using single-crystal diffraction methods (powder diffraction patterns are very similar).
A larger number of synthetic members have been prepared.
Unique Identifiers
Mindat ID:
39614
Long-form identifier:
mindat:1:1:39614:3
Chemical Analysis
Oxide wt%:
| 1 | 2 | 3 | 4 | 5 | 6 | |
|---|---|---|---|---|---|---|
| SiO2 | 19.86 % | 19.49 % | 19.18 % | 20.64 % | 18.16 % | 22.01 % |
| TiO2 | 17.07 % | 16.98 % | 16.23 % | 19.15 % | 0.09 % | 18.34 % |
| ThO2 | 1.62 % | 3.55 % | 3.05 % | 0.68 % | 1.98 % | |
| Al2O3 | 0.07 % | 0.10 % | 0.38 % | 0.73 % | 4.05 % | |
| FeO | 10.06 % | 9.13 % | 10.80 % | 8.17 % | 6.04 % | |
| MnO | 1.01 % | 2.65 % | 0.82 % | 1.70 % | ||
| MgO | 0.49 % | 0.09 % | 0.13 % | 0.40 % | 2.43 % | 0.60 % |
| CaO | 3.20 % | 2.09 % | 2.59 % | 3.94 % | 0.76 % | 4.46 % |
| SrO | 0.32 % | 0.28 % | 1.28 % | |||
| Na2O | 0.17 % | 0.14 % | 0.09 % | 0.47 % | ||
| K2O | 0.07 % | 0.08 % | 0.07 % | |||
| Y2O3 | 0.29 % | 0.06 % | 0.37 % | 0.40 % | 0.22 % | 1.00 % |
| La2O3 | 23.76 % | 23.75 % | 19.48 % | 21.01 % | 14.58 % | 9.68 % |
| Ce2O3 | 19.26 % | 19.63 % | 22.31 % | 18.24 % | 23.29 % | 19.69 % |
| Pr2O3 | 2.46 % | 2.36 % | 2.43 % | 2.16 % | 1.89 % | 2.05 % |
| Nd2O3 | 2.32 % | 1.52 % | 3.14 % | 2.25 % | 6.13 % | 7.26 % |
| Tb2O3 | 0.16 % | 0.17 % | 0.21 % | 0.13 % | ||
| Yb2O3 | 0.06 % | 0.06 % | 0.13 % | 0.11 % | 0.12 % | |
| Dy2O3 | 0.15 % | 0.03 % | 0.22 % | |||
| Ho2O3 | 0.06 % | 0.09 % | ||||
| Eu2O3 | 0.07 % | |||||
| Sm2O3 | 0.74 % | 0.96 % | ||||
| Gd2O3 | 0.37 % | 0.57 % | ||||
| Er2O3 | 0.04 % | |||||
| WO3 | 15.53 % | |||||
| Fe2O3 | 12.86 % | |||||
| H2Ocalc | 1.33 % | |||||
| F | 0.05 % | |||||
| Cl | 0.03 % | |||||
| O=(F, Cl) | -0.03 % | |||||
| Total: | 102.25 % | 102.34 % | 101.19 % | 101.11 % | 99.35 % | 98.91 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 5 | (Ce1.89La.19Nd0.48Pr0.15Sm0.06Gd0.03Y0.03Ca0.18)Σ4.01(Fe3+2.14W0.89Mg0.80Al0.19Ti0.02)Σ4.04Si 4.01O20(OH1.96F0.04)Σ2 |
Sample references:
| ID | Type | Locality | Reference | Notes |
|---|---|---|---|---|
| 1 | Buer, Bjørkedalen, Porsgrunn, Telemark, Norway | Electron microprobe | ||
| 2 | Hviteberget, Stokkøya, Larvik Commune, Vestfold, Norway | Electron microprobe. Total Fe as FeO | ||
| 3 | Grønåsveien, Bugården, Sandefjord, Vestfold, Norway | Electron microprobe | ||
| 4 | Buer, Bjørkedalen, Porsgrunn, Telemark, Norway | Electron microprobe analyses on polished sections | ||
| 5 | Type Specimen | Nya Bastnäs deposit, Bastnäs Mines, Riddarhyttan, Skinnskatteberg, Västmanland County, Sweden |
Água de Pau Volcano, São Miguel, Azores, Portugal