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Cobaltoan calcite-spherocobaltite

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About Cobaltoan calcite-spherocobaltiteHide

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.

Other InformationHide

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 Cobaltoan calcite-spherocobaltiteHide

Reference List:
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Chave, Keith A. (1952) A Solid Solution between Calcite and Dolomite, Journal of Geology, 60:190-192.
Deelman, J. C. (1999): Low-temperature nucleation of magnesite and dolomite, Neues Jahrbuch für Mineralogie, Monatshefte, pp. 289–302.
Mansfield, Charles F. (1980). A urolith of biogenic dolomite – another clue in the dolomite mystery. Geochimica et Cosmochimica Acta. 44(6): 829–839.
Rodriguez-Blanco, J. D., Shaw, S. and Benning, L. G. (2015) A route for the direct crystallization of dolomite. American Mineralogist, 100:1172-1181.

Internet Links for Cobaltoan calcite-spherocobaltiteHide

Localities for Cobaltoan calcite-spherocobaltiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Drâa-Tafilalet
    • Ouarzazate Province
      • Tazenakht
        • Bou Azzer District (Bou Azer District)
Van King
Van King
Van King
  • Andalusia
    • Almería
      • Huércal-Overa
        • Cuesta Alta
Van King
Van King
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