Mariposite

Where it forms, where it's found

Type locality: Mariposa County
California
USA

79recorded occurrences

Source · OpenStreetMap

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 12 15.999 191.988
31.40%
13AlAluminium Aluminium 6 26.982 161.892
26.48%
14SiSilicon Silicon 4 28.085 112.340
18.38%
24CrChromium Chromium 2 51.996 103.992
17.01%
19KPotassium Potassium 1 39.098 39.098
6.40%
1HHydrogen Hydrogen 2 1.008 2.016
0.33%
Total 611.326 100.00%
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
8OOxygen	Oxygen	12	15.999	191.988	31.40%
13AlAluminium	Aluminium	6	26.982	161.892	26.48%
14SiSilicon	Silicon	4	28.085	112.340	18.38%
24CrChromium	Chromium	2	51.996	103.992	17.01%
19KPotassium	Potassium	1	39.098	39.098	6.40%
1HHydrogen	Hydrogen	2	1.008	2.016	0.33%
	Total	611.326	100.00%

Synonyms

Chrome-Phengite
Chromphengit
Chromphengita
Chromphengite
Mariposit
Mariposita

Literature, links & citation

Citations

—https://geology.com/rocks/mariposite.shtml
1957Bowen, O.E., Jr. & Gray, C.H., Jr. (1957): Mines and mineral deposits of Mariposa County, California: California Journal of Mines and Geology 53, 34-343.
1983Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Mariposite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/mariposite-10003},
  note      = {Accessed 2026-05-11}
}