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CoSO4 · H2O
2 - 3
Member of:
A cobalt analogue of kieserite.

A synthetic kieserite-cobaltkieserite solid solution has been analyzed (Bechtold and Wildner, 2016).

Classification of Cobaltkieserite

Approval Year:

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations

Physical Properties of Cobaltkieserite

Hardness (Mohs):
2 - 3
Hardness Data:
3.28 g/cm3 (Calculated)

Optical Data of Cobaltkieserite

Biaxial (+)

Chemical Properties of Cobaltkieserite

CoSO4 · H2O
Elements listed in formula:
Analytical Data:
Means of 20 sets of electron microprobe data. H2O calculated
CoO 42.7
FeO 0.2
SiO2 0.3
As2O5 4.3
SO3 4.2
H2O (10.5)

Total 102.2 wt.%

Crystallography of Cobaltkieserite

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 6.98 Å, b = 7.588 Å, c = 7.639 Å
β = 118.65°
a:b:c = 0.92 : 1 : 1.007
Unit Cell Volume:
V 355.06 ų
Euhedral, thick tablular to "bipyramidal" habit.
X-Ray Powder Diffraction Data:
4.829 (33)
3.405 (100)
3.339 (34)
3.291 (32)
3.062 (56)
2.567 (30)
2.513 (49)

Type Occurrence of Cobaltkieserite

General Appearance of Type Material:
Euhedral crystals 0.5-3µm
Geological Setting of Type Material:
In a dark, dense quartzitic rock.
Empirical Formula:
Co0.98(S0.95As0.06Si0.01)Σ1.02O4.00 · 1.00H2O

Relationship of Cobaltkieserite to other Species

Member of:
Other Members of Group:
Dwornikite(Ni,Fe)SO4 · H2O
GunningiteZnSO4 · H2O
KieseriteMgSO4 · H2O
SerrabrancaiteMnPO4 · H2O
SzmikiteMnSO4 · H2O
SzomolnokiteFeSO4 · H2O
7.CB.05DwornikiteNiSO4 · H2O
7.CB.05GunningiteZnSO4 · H2O
7.CB.05KieseriteMgSO4 · H2O
7.CB.05PoiteviniteCuSO4 · H2O
7.CB.05SzmikiteMn2+SO4 · H2O
7.CB.05SzomolnokiteFe2+SO4 · H2O
7.CB.07SanderiteMgSO4 · 2H2O
7.CB.10BonattiteCuSO4 · 3H2O
7.CB.15AplowiteCoSO4 · 4H2O
7.CB.15BoyleiteZnSO4 · 4H2O
7.CB.15IlesiteMn2+SO4 · 4H2O
7.CB.15RozeniteFe2+SO4 · 4H2O
7.CB.15StarkeyiteMgSO4 · 4H2O
7.CB.15DrobeciteCdSO4 · 4H2O
7.CB.15CranswickiteMgSO4 · 4H2O
7.CB.20ChalcanthiteCuSO4 · 5H2O
7.CB.20JôkokuiteMn2+SO4 · 5H2O
7.CB.20PentahydriteMgSO4 · 5H2O
7.CB.20Siderotil(Fe,Cu)SO4 · 5H2O
7.CB.25BianchiteZnSO4 · 6H2O
7.CB.25ChvaleticeiteMnSO4 · 6H2O
7.CB.25FerrohexahydriteFe2+SO4 · 6H2O
7.CB.25HexahydriteMgSO4 · 6H2O
7.CB.25MoorhouseiteCoSO4 · 6H2O
7.CB.25NickelhexahydriteNiSO4 · 6H2O
7.CB.30RetgersiteNiSO4 · 6H2O
7.CB.35BieberiteCoSO4 · 7H2O
7.CB.35BoothiteCuSO4 · 7H2O
7.CB.35MallarditeMn 2+SO4 · 7H2O
7.CB.35MelanteriteFe2+SO4 · 7H2O
7.CB.35ZincmelanteriteZnSO4 · 7H2O
7.CB.35Alpersite(Mg,Cu2+)SO4 · 7H2O
7.CB.40EpsomiteMgSO4 · 7H2O
7.CB.40GoslariteZnSO4 · 7H2O
7.CB.40MorenositeNiSO4 · 7H2O
7.CB.45AlunogenAl2(SO4)3(H2O)12 · 5H2O
7.CB.45Meta-alunogenAl2(SO4)3 · 14H2O
7.CB.50AluminocoquimbiteAlFe(SO4)3 · 9H2O
7.CB.55CoquimbiteFe23+(SO4)3 · 9H2O
7.CB.55ParacoquimbiteFe23+(SO4)3 · 9H2O
7.CB.55Rhomboclase(H3O)Fe3+(SO4)2 · 3H2O
7.CB.60KorneliteFe23+(SO4)3 · 7H2O
7.CB.65QuenstedtiteFe23+(SO4)3 · 11H2O
7.CB.70LauseniteFe23+(SO4)3 · 5H2O
7.CB.75LishizheniteZnFe23+(SO4)4 · 14H2O
7.CB.75RömeriteFe2+Fe23+(SO4)4 · 14H2O
7.CB.80RansomiteCuFe23+(SO4)4 · 6H2O
7.CB.85ApjohniteMn2+Al2(SO4)4 · 22H2O
7.CB.85BíliniteFe2+Fe23+(SO4)4 · 22H2O
7.CB.85DietrichiteZnAl2(SO4)4 · 22H2O
7.CB.85HalotrichiteFe2+Al2(SO4)4 · 22H2O
7.CB.85PickeringiteMgAl2(SO4)4 · 22H2O
7.CB.85RedingtoniteFe2+Cr2(SO4)4 · 22H2O
7.CB.85WupatkiiteCoAl2(SO4)4 · 22H2O
7.CB.90MeridianiiteMgSO4 · 11H2O

Other Names for Cobaltkieserite

Name in Other Languages:
Simplified Chinese:水钴矾
Traditional Chinese:水鈷礬

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Cobaltkieserite

Reference List:
Holtstam, D. (2002): Geologiska Föreningens i Stockholm Förhandlinger: 124: 117-119.

Bechtold, A. and Wildner, M. (2016): Crystal chemistry of the kieserite-cobaltkieserite solid solution, Mg1-xCox(SO4)⋅H2O: well-behaved oddities. European Journal of Mineralogy: 28 (in press); (2016)

Internet Links for Cobaltkieserite URL:
Please feel free to link to this page.

Localities for Cobaltkieserite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Czech Republic
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
Jan Hloušek
Sweden (TL)
  • Västmanland
    • Skinnskatteberg
      • Riddarhyttan
Holtstam, D. (2002): Cobaltkieserite, CoSO4·H2O, a new mineral species from Bastnäs, Skinnskatteberg, Sweden. Geologiska Föreningens i Stockholm Förhandlingar, 124, 117-119
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