Brandãosite

Where it forms, where it's found

1recorded occurrences

Source · OpenStreetMap

Optical

Optical type: Isotropic

Isotropy testPPL ↔ XPL diagnostic

PPL intrinsic colour; no change on stage rotation

XPL extinct at every orientation

Crystallography

Crystal system: Isometric

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
34.86%
8OOxygen Oxygen 15 15.999 239.985
24.97%
25MnManganese Manganese 4 54.938 219.752
22.86%
14SiSilicon Silicon 4 28.085 112.340
11.69%
13AlAluminium Aluminium 2 26.982 53.964
5.62%
Total 961.111 100.00%
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	34.86%
8OOxygen	Oxygen	15	15.999	239.985	24.97%
25MnManganese	Manganese	4	54.938	219.752	22.86%
14SiSilicon	Silicon	4	28.085	112.340	11.69%
13AlAluminium	Aluminium	2	26.982	53.964	5.62%
	Total	961.111	100.00%

Synonyms

Brandãosit
Brandãosita

Literature, links & citation

Cite this entry

Entry last updated August 11, 2025

@misc{mineral2025,
  author    = {Mineral Index editorial board},
  title     = {Brandãosite — Mineral Index},
  year      = {2025},
  url       = {https://mineralindex.org/minerals/brandaosite-822}
}