| Jinshajiangite | |
| Category: | Sorosilicate |
| Formula: | BaNaFe4Ti2(Si2O7)2O2(OH)2F |
| Imasymbol: | Jsh[1] |
| Strunz: | 9.BE.67 |
| System: | Monoclinic |
| Class: | Prismatic (2/m) (same H-M symbol) |
| Symmetry: | C2/m |
| Unit Cell: | a = 10.6785, b = 13.786 c = 20.700 [Å], β = 94.937° |
| References: | [2] [3] |
Jinshajiangite is a rare silicate mineral named after the Jinshajiang river in China.[4] Its currently accepted formula is BaNaFe4Ti2(Si2O7)2O2(OH)2F. It gives a name of the jinshajiangite group. The mineral is associated with alkaline rocks. In jinshajiangite, there is a potassium-to-barium, calcium-to-sodium, manganese-to-iron and iron-to-titanium diadochy substitution. Jinshajiangite is the iron-analogue of surkhobite and perraultite.[5] It is chemically related to bafertisite, cámaraite and emmerichite.[6] Its structure is related to that of bafertisite. Jinshajiangite is a titanosilicate with heteropolyhedral HOH layers, where the H-layer is a mixed tetrahedral-octahedral layer, and the O-layer is simply octahedral.
The mineral has only two known places of natural occurrences; a dyke near Jinshajiang River, Sichuan Province and the intrusion of Norra Kärr in Sweden.[7] [8]