Ferri-hellandite-(Ce)

Where it forms, where it's found

Type locality: Sagåsen Quarry
Sagåsen
Auenlandet
Porsgrunn
Telemark
Norway
59.0439°, 9.8282°

1recorded occurrences

Source · OpenStreetMap

Crystallography

Crystal system: Monoclinic
Space group: P2/a
Cell parameters: a = 19.1616(2) Å · b = 4.7561(1) Å · c = 10.34016(1) Å
Cell angles: β = 111.173(1) °
Ratio a:b:c: 1 : 0.248 : 0.540

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
58CeCerium Cerium 3 140.116 420.348
35.21%
8OOxygen Oxygen 24 15.999 383.976
32.16%
20CaCalcium Calcium 3 40.078 120.234
10.07%
14SiSilicon Silicon 4 28.085 112.340
9.41%
26FeIron Iron 2 55.845 111.690
9.36%
5BBoron Boron 4 10.810 43.240
3.62%
1HHydrogen Hydrogen 2 1.008 2.016
0.17%
Total 1193.844 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From IMA formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
58CeCerium	Cerium	3	140.116	420.348	35.21%
8OOxygen	Oxygen	24	15.999	383.976	32.16%
20CaCalcium	Calcium	3	40.078	120.234	10.07%
14SiSilicon	Silicon	4	28.085	112.340	9.41%
26FeIron	Iron	2	55.845	111.690	9.36%
5BBoron	Boron	4	10.810	43.240	3.62%
1HHydrogen	Hydrogen	2	1.008	2.016	0.17%
	Total	1193.844	100.00%

Synonyms

Ferri-hellandiet-(Ce)
IMA2020-085

In other languages

German: Ferri-Hellandit-(Ce) · IMA 2020-085

Classification

Strunz

10th ed.

9.DK

9SilicatesClass
9.DInosilicatesDivision
9.DKInosilicates with 5-periodic single chainsGroup
9.DKFerri-hellandite-(Ce)Species

Group, growth & confusion

6 members

Literature, links & citation

Citations

2021Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2021) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) CNMNC Newsletter No 60. Mineralogical Magazine, 1-5 doi:10.1180/mgm.2021.30DOI: 10.1180/mgm.2021.30

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Ferri-hellandite-(Ce) — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/ferri-hellandite-ce-55376},
  note      = {Accessed 2026-05-11}
}