Cobalt-bearing Talmessite

Where it forms, where it's found

4recorded occurrences

Source · OpenStreetMap

Safety & handling

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 10 15.999 159.990
33.52%
33AsArsenic Arsenic 2 74.922 149.844
31.40%
20CaCalcium Calcium 2 40.078 80.156
16.80%
27CoCobalt Cobalt 1 58.933 58.933
12.35%
12MgMagnesium Magnesium 1 24.305 24.305
5.09%
1HHydrogen Hydrogen 4 1.008 4.032
0.84%
Total 477.260 100.00%
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	10	15.999	159.990	33.52%
33AsArsenic	Arsenic	2	74.922	149.844	31.40%
20CaCalcium	Calcium	2	40.078	80.156	16.80%
27CoCobalt	Cobalt	1	58.933	58.933	12.35%
12MgMagnesium	Magnesium	1	24.305	24.305	5.09%
1HHydrogen	Hydrogen	4	1.008	4.032	0.84%
	Total	477.260	100.00%

Synonyms

Cobaltoan Talmessite

Literature, links & citation

Citations

2002Weiß, Stefan; Lengauer, Christian L.; Parodi, GianCarlo (2002) Roselith, Wendwilsonit und kobalthaltiger Talmessit aus Bou Azzer, Marokko [Roselite, wendwilsonite and cobalt-bearing talmessite from Bou Azzer, Morocco]. Lapis, 27 (1). 37-41; 58

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Cobalt-bearing Talmessite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/cobalt-bearing-talmessite-29049},
  note      = {Accessed 2026-05-11}
}