Metacarbonate slag
A rock subtype
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Type of pyrometamorphic rock formed in expense of carbonate protolith via its calcination (decarbonatization). As such it differs from the artificial, smelting slags.
Typical features of metacarbonate rocks:
- unique mineral composition: magnesioferrite, calcium ferrites (often Mn-rich; srebrodolskite, harmunite, "grandiferrite", and others), fluorellestadite-fluorapatite solid solution, melilite group (gehlenite), cuspidine, maghemite, perovskite, periclase, portlandite, oldhamite, fluorite, rhönite group, Ca-Mg silicates, thaumasite or related species, and other minerals
- occurrence of rather large amounts of Ca carbonates (aragonite, calcite), plus (sometimes) gypsum and anhydrite
- common rounded shape - a reminiscence of the parent carbonate concretion shape
- mineralogical zonation in form of so-called "nutshell"
The metacarbonate slags are often found within partially coalesced (fused together) various lithological types of pyrometamorphic rocks to form a pyrometamorphic breccia.
Typical features of metacarbonate rocks:
- unique mineral composition: magnesioferrite, calcium ferrites (often Mn-rich; srebrodolskite, harmunite, "grandiferrite", and others), fluorellestadite-fluorapatite solid solution, melilite group (gehlenite), cuspidine, maghemite, perovskite, periclase, portlandite, oldhamite, fluorite, rhönite group, Ca-Mg silicates, thaumasite or related species, and other minerals
- occurrence of rather large amounts of Ca carbonates (aragonite, calcite), plus (sometimes) gypsum and anhydrite
- common rounded shape - a reminiscence of the parent carbonate concretion shape
- mineralogical zonation in form of so-called "nutshell"
The metacarbonate slags are often found within partially coalesced (fused together) various lithological types of pyrometamorphic rocks to form a pyrometamorphic breccia.
Unique Identifiers
Mindat ID:
53428
Long-form identifier:
mindat:1:1:53428:4
GUID
(UUID V4):
(UUID V4):
c238652e-df22-41fb-8717-bdc6f3d18cb1
Classification of Metacarbonate slag
- Rock
- Metamorphic rock
- Contact metamorphic rock
- Metacarbonate slag
- Contact metamorphic rock
- Metamorphic rock
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Metacarbonate slag associated with Magnesioferrite | MgFe3+2O4 |
| 2 photos of Metacarbonate slag associated with Hematite | Fe2O3 |
| 2 photos of Metacarbonate slag associated with Buchite | |
| 2 photos of Metacarbonate slag associated with Glass | |
| 2 photos of Metacarbonate slag associated with Cuspidine | Ca8(Si2O7)2F4 |
| 2 photos of Metacarbonate slag associated with Gehlenite | Ca2Al[AlSiO7] |
| 1 photo of Metacarbonate slag associated with Giuseppettite | (Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2 |
| 1 photo of Metacarbonate slag associated with Forsterite | Mg2SiO4 |
| 1 photo of Metacarbonate slag associated with Fluorite | CaF2 |
| 1 photo of Metacarbonate slag associated with Srebrodolskite | Ca2Fe3+2O5 |
References for Metacarbonate slag
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sokol, E.V., Maksimova, N.V., Nigmatulina, E.N., Sharygin, V.V., Kalugin, V.M., (2005): Combustion Metamorphism. Publishing House of the SB RAS, Novosibirsk: 284 pp. [in Russian, with fragments/summaries/abstracts in English]
Ciesielczuk, J., Kruszewski Ł., and Majka, J. (2015): Comparative mineralogical study of thermally-altered coal-dump waste, natural rocks and the products of laboratory heating experiments. International Journal of Coal Geology: 9: 114-141
Kruszewski, Ł. - personal field observations and laboratory anal
Internet Links for Metacarbonate slag
mindat.org URL:
https://www.mindat.org/min-53428.html
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