Magnesio-fluoro-hastingsite

Where it forms, where it's found

Type locality: Uroi Hill (Arany Hill)
Simeria
Hunedoara County
Romania
45.8605°, 23.0444°

4recorded occurrences

Source · OpenStreetMap

Crystallography

Crystal system: Monoclinic
Space group: #11
Cell parameters: a = 9.872 Å · b = 18.007 Å · c = 5.314 Å
Cell angles: β = 105.37 °
Ratio a:b:c: 1 : 1.824 : 0.538

Crystal structure

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 22 15.999 351.978
40.52%
14SiSilicon Silicon 6 28.085 168.510
19.40%
12MgMagnesium Magnesium 4 24.305 97.220
11.19%
20CaCalcium Calcium 2 40.078 80.156
9.23%
26FeIron Iron 1 55.845 55.845
6.43%
13AlAluminium Aluminium 2 26.982 53.964
6.21%
9FFluorine Fluorine 2 18.998 37.996
4.37%
11NaSodium Sodium 1 22.990 22.990
2.65%
Total 868.659 100.00%
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
8OOxygen	Oxygen	22	15.999	351.978	40.52%
14SiSilicon	Silicon	6	28.085	168.510	19.40%
12MgMagnesium	Magnesium	4	24.305	97.220	11.19%
20CaCalcium	Calcium	2	40.078	80.156	9.23%
26FeIron	Iron	1	55.845	55.845	6.43%
13AlAluminium	Aluminium	2	26.982	53.964	6.21%
9FFluorine	Fluorine	2	18.998	37.996	4.37%
11NaSodium	Sodium	1	22.990	22.990	2.65%
	Total	868.659	100.00%

Synonyms

Fluormagnesiohastingsite
Fluoro-magnesiohastingsite
IMA2005-002
Magnesio-fluoro-hastingsiet

In other languages

German: IMA 2005-002 · Magnesio-Fluoro-Hastingsit
Italian: fluoro-magnesio-hastingsite · fluoro-magnesiohastingsite · magnesio-fluoro-hastingsite

Classification

Strunz

10th ed.

9.DE.15

9SilicatesClass
9.DInosilicatesDivision
9.DEInosilicates with 2-periodic double chains, Si₄O₁₁; ClinoamphibolesGroup
9.DE.15Magnesio-fluoro-hastingsiteSpecies

Group, growth & confusion

6 members

Literature, links & citation

Citations

2006Hawthorne, F. C., Oberti, R. (2006) On the classification of amphiboles. The Canadian Mineralogist, 44 (1) 1-21 doi:10.2113/gscanmin.44.1.1DOI: 10.2113/gscanmin.44.1.1
2006Bojar, Hans-Peter, Walter, Franz (2006) Fluoro-magnesiohastingsite from Dealul Uroi (Hunedoara county, Romania): Mineral data and crystal structure of a new amphibole end-member. European Journal of Mineralogy, 18 (4) 503-508 doi:10.1127/0935-1221/2006/0018-0503DOI: 10.1127/0935-1221/2006/0018-0503
2012Hawthorne, F. C., Oberti, R., Harlow, G. E., Maresch, W. V., Martin, R. F., Schumacher, J. C., Welch, M. D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist, 97 (11) 2031-2048 doi:10.2138/am.2012.4276 DOI: 10.2138/am.2012.4276
2014(2014) Magnesio-fluoro-hastingsite. Handbook of Mineralogy. Mineralogical Society of America

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Magnesio-fluoro-hastingsite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/magnesio-fluoro-hastingsite-27442},
  note      = {Accessed 2026-05-11}
}