Where it forms, where it's found
- Geological setting
Meso-Proterozoic dolomite-calcite carbonatite dike
- Type locality
- Bayan Obo deposit
- Bayan Obo mining district
- Baotou City
- Inner Mongolia
- China
41.7958°, 109.9694°
1recorded occurrences
Physical
Optical
- Optical type
- Uniaxial (-)
- Pleochroism
- Visible
dark orange-red to pale yellow
- Notes
The refractive indices of oboniobite are too high to be measured using available index liquids, with the average index of refraction calculated as 2.092 based on the Gladstone-Dale relationship
Crystallography
- Space group
- P-3c1
- Cell parameters
- a = 5.1804(2) Å · c = 14.0768(6) Å
- Z
- 2
- Type-locality form
Oboniobite is well crystallized, exhibiting a platy or subrounded morphology, with dimensions ranging from 15 to 30 μm in width and 30 to 70 μm in length.
Chemical composition
Synonyms
- IMA2023-118a
- Oboniobiet
In other languages
- German
- Oboniobit
Classification
Strunz
10th ed.4.CC
- 4OxidesClass
- 4.CMetal: Oxygen = 2: 3,3: 5, and similarDivision
- 4.CCWith large and medium-sized cationsGroup
- 4.CCOboniobiteSpecies
Literature, links & citation
Citations
- —She, H.-D., Fan, H.-R., Gu, X.-P., Li, X.-C., Yang, K.-F., Wang, Q.-W., Jin, H.-L. and Chen, B. (2024) Oboniobite, IMA 2023-118a.
- 2024Haidong, She, Shuangliang, Liu, Hongrui, Fan, Xiangping, Gu, Xiaochun, Li, Kuifeng, Yang, Qiwei, Wang (2024) Oboniobite and Scandio-fluoro-eckermannite, two new minerals in the Bayan Obo deposit, Inner Mongolia. Chinese Journal of Geology, 59 (5). doi:10.12017/dzkx.2024.101DOI: 10.12017/dzkx.2024.101
- 2025She, Hai-Dong; Fan, Hong-Rui; Gu, Xiang-Ping; Li, Xiao-Chun; Yang, Kui-Feng; Wang, Qi-Wei; Jin, Hai-Long; Chen, Biao; Pan, Yong-Xin (2025) Oboniobite (Mg4Nb2O9), a new magnesic-niobic oxide mineral from the Bayan Obo deposit, China. American Mineralogist, 110 (7). 1094-1104 doi:10.2138/am-2024-9469DOI: 10.2138/am-2024-9469
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Oboniobite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/oboniobite-471109},
note = {Accessed 2026-05-11}
}