Cobalt-bearing Calcite-Spherocobaltite
A solid-solution series between two end-member minerals
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About Cobalt-bearing Calcite-Spherocobaltite
Series Formula:
(Ca,Co)CO3 to CoCO3
A series between Cobalt-bearing Calcite and Spherocobaltite
Cobaltoan dolomite and cobaltoan calcite are frequently mislabeled as spherocobaltite. Both cobaltoan calcite and cobaltoan dolomite may vary from light pink through some shade of red, sometimes grading into purple. Many validated visibly crystallized spherocobaltite specimens show peculiar curved dislocations, but that distinction is of unknown significance. Many cobaltoan carbonates are crystallized as simple rhombohedrons rather than as scalenohedrons or other dominant forms. That variance in crystal shapes has been confusing, although these forms are common among the carbonates. Cobaltoan calcite and cobaltoan dolomite are far more common than spherocobaltite and cobalt-dominant members of the Dolomite group are unknown. Chave (1951) was one of the earliest studies to show that chemical substitution in calcite to dolomite is discontinuous. Between 15-20% mole percent of Mg in calcite yields ordering toward the dolomite structure. It is recommended that unless useful analytical data, etc. have been presented along with the photograph, an intermediate name should be used for members of this series.
Cobaltoan dolomite and cobaltoan calcite are frequently mislabeled as spherocobaltite. Both cobaltoan calcite and cobaltoan dolomite may vary from light pink through some shade of red, sometimes grading into purple. Many validated visibly crystallized spherocobaltite specimens show peculiar curved dislocations, but that distinction is of unknown significance. Many cobaltoan carbonates are crystallized as simple rhombohedrons rather than as scalenohedrons or other dominant forms. That variance in crystal shapes has been confusing, although these forms are common among the carbonates. Cobaltoan calcite and cobaltoan dolomite are far more common than spherocobaltite and cobalt-dominant members of the Dolomite group are unknown. Chave (1951) was one of the earliest studies to show that chemical substitution in calcite to dolomite is discontinuous. Between 15-20% mole percent of Mg in calcite yields ordering toward the dolomite structure. It is recommended that unless useful analytical data, etc. have been presented along with the photograph, an intermediate name should be used for members of this series.
Unique Identifiers
Mindat ID:
51481
Long-form identifier:
mindat:1:1:51481:9
GUID
(UUID V4):
(UUID V4):
bface654-b4ae-41bf-81bc-b7f3d34e34e4
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0000104 | Spherocobaltite | Graf D L (1961) Crystallographic tables for the rhombohedral carbonates American Mineralogist 46 1283-1316 | 1961 | 0 | 293 | ||
0010021 | Spherocobaltite | Pertlik F (1986) Structures of hydrothermally synthesized cobalt(II) carbonate and nickel(II) carbonate Acta Crystallographica C42 4-5 | 1986 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
Common Associates
Associated Minerals Based on Photo Data:
4 photos of Cobalt-bearing Calcite-Spherocobaltite associated with Paratacamite | Cu3(Cu,Zn)(OH)6Cl2 |
4 photos of Cobalt-bearing Calcite-Spherocobaltite associated with Hematite | Fe2O3 |
4 photos of Cobalt-bearing Calcite-Spherocobaltite associated with Quartz | SiO2 |
1 photo of Cobalt-bearing Calcite-Spherocobaltite associated with Smolyaninovite | Co3Fe3+2(AsO4)4 · 11H2O |
1 photo of Cobalt-bearing Calcite-Spherocobaltite associated with Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
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.
Internet Links for Cobalt-bearing Calcite-Spherocobaltite
mindat.org URL:
https://www.mindat.org/min-51481.html
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References for Cobalt-bearing Calcite-Spherocobaltite
Reference List:
Localities for Cobalt-bearing Calcite-Spherocobaltite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Bou Azzer mining district, Drâa-Tafilalet Region, Morocco