Chromium-bearing Dravite

Where it forms, where it's found

4recorded occurrences

Source · OpenStreetMap

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 31 15.999 495.969
34.77%
24CrChromium Chromium 9 51.996 467.964
32.80%
14SiSilicon Silicon 6 28.085 168.510
11.81%
13AlAluminium Aluminium 6 26.982 161.892
11.35%
12MgMagnesium Magnesium 3 24.305 72.915
5.11%
5BBoron Boron 3 10.810 32.430
2.27%
11NaSodium Sodium 1 22.990 22.990
1.61%
1HHydrogen Hydrogen 4 1.008 4.032
0.28%
Total 1426.702 100.00%
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	31	15.999	495.969	34.77%
24CrChromium	Chromium	9	51.996	467.964	32.80%
14SiSilicon	Silicon	6	28.085	168.510	11.81%
13AlAluminium	Aluminium	6	26.982	161.892	11.35%
12MgMagnesium	Magnesium	3	24.305	72.915	5.11%
5BBoron	Boron	3	10.810	32.430	2.27%
11NaSodium	Sodium	1	22.990	22.990	1.61%
1HHydrogen	Hydrogen	4	1.008	4.032	0.28%
	Total	1426.702	100.00%

Synonyms

Chromian Dravite
Cr-dravite

Literature, links & citation

Citations

1968Peltola, E., Vuorelainen, Y., Häkli, T.A. (1968) A chromian tourmaline from Outokumpu, Finland. Bulletin of the Geological Society of Finland, 40. 35-38 doi:10.17741/bgsf/40.004 DOI: 10.17741/bgsf/40.004

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Chromium-bearing Dravite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/chromium-bearing-dravite-9286},
  note      = {Accessed 2026-05-11}
}