Longshoushanite-(Ce)

Where it forms, where it's found

Type locality: Longshoushan Uranium ore zone
Jinchuan District
Jinchang
Gansu
China

Crystallography

Crystal system: Monoclinic
Space group: P21/a
Cell parameters: a = 13.6854(10) Å · b = 5.6292(2) Å · c = 11.6868(8) Å
Cell angles: β = 113.718(8) °
Ratio a:b:c: 1 : 0.411 : 0.854

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
58CeCerium Cerium 4 140.116 560.464
46.75%
8OOxygen Oxygen 22 15.999 351.978
29.36%
14SiSilicon Silicon 4 28.085 112.340
9.37%
22TiTitanium Titanium 2 47.867 95.734
7.99%
13AlAluminium Aluminium 2 26.982 53.964
4.50%
12MgMagnesium Magnesium 1 24.305 24.305
2.03%
Total 1198.785 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From Mindat formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
58CeCerium	Cerium	4	140.116	560.464	46.75%
8OOxygen	Oxygen	22	15.999	351.978	29.36%
14SiSilicon	Silicon	4	28.085	112.340	9.37%
22TiTitanium	Titanium	2	47.867	95.734	7.99%
13AlAluminium	Aluminium	2	26.982	53.964	4.50%
12MgMagnesium	Magnesium	1	24.305	24.305	2.03%
	Total	1198.785	100.00%

Synonyms

IMA2025-081
Longshoushaniet-(Ce)

In other languages

Catalan: Longshoushanita- · longshoushanita-(Ce)

Classification

Strunz

10th ed.

9.BE

9SilicatesClass
9.BSorosilicatesDivision
9.BESi₂O₇ groups, with additional anions; cations in octahedral [6] and greater coordinationGroup
9.BELongshoushanite-(Ce)Species

Literature, links & citation

Citations

—Hao, J., Sun, N., Xue, Y., Su, S., Zhang, X. and Li, G. (2026) Longshoushanite-(Ce), IMA 2025-081. CNMNC Newsletter 89, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10199

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Longshoushanite-(Ce) — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/longshoushanite-ce-499371},
  note      = {Accessed 2026-05-11}
}