Jinshajiangite
Rare silicate mineral
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Jinshajiangite is a rare silicate mineral named after the Jinshajiang river in China.[4][3] Its currently accepted formula is BaNaFe4Ti2(Si2O7)2O2(OH)2F.[5] It gives a name of the jinshajiangite group.[3] 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[5] and perraultite.[6] It is chemically related to bafertisite, cámaraite[3] and emmerichite.[7] 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.[5]
| Jinshajiangite | |
|---|---|
Jinshajiangite crystals. Locality: Luku Mine, Panzhihua, Sichuan Province, China | |
| General | |
| Category | Sorosilicate |
| Formula | BaNaFe4Ti2(Si2O7)2O2(OH)2F |
| IMA symbol | Jsh[1] |
| Strunz classification | 9.BE.67 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/m |
| Unit cell | a = 10.6785, b = 13.786 c = 20.700 [Å], β = 94.937° |
| Identification | |
| References | [2][3] |
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.[8][5]
