Ripidolite

Where it forms, where it's found

153recorded occurrences

Source · OpenStreetMap

Optical

UV response: None

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
26FeIron Iron 6 55.845 335.070
28.91%
8OOxygen Oxygen 18 15.999 287.982
24.84%
13AlAluminium Aluminium 10 26.982 269.820
23.28%
12MgMagnesium Magnesium 6 24.305 145.830
12.58%
14SiSilicon Silicon 4 28.085 112.340
9.69%
1HHydrogen Hydrogen 8 1.008 8.064
0.70%
Total 1159.106 100.00%
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
26FeIron	Iron	6	55.845	335.070	28.91%
8OOxygen	Oxygen	18	15.999	287.982	24.84%
13AlAluminium	Aluminium	10	26.982	269.820	23.28%
12MgMagnesium	Magnesium	6	24.305	145.830	12.58%
14SiSilicon	Silicon	4	28.085	112.340	9.69%
1HHydrogen	Hydrogen	8	1.008	8.064	0.70%
	Total	1159.106	100.00%

Synonyms

Angaralit
Angaralita
Angaralite
Fächerstein
Ogcoit
Ogcoita
Ogcoite
Ogkoit
Ogkonkoit
Oncoita
Oncoite
Onkoit
Rhipidolith
Ripidolit
Ripidolita

Literature, links & citation

Citations

1954Hey, Max H. (1954) A new review of the chlorites. Mineralogical Magazine and Journal of the Mineralogical Society, 30 (224) 277-292 doi:10.1180/minmag.1954.030.224.01 DOI: 10.1180/minmag.1954.030.224.01

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Ripidolite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/ripidolite-3424},
  note      = {Accessed 2026-05-11}
}