Calc-skarn
A rock classification type
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A high to medium-temperature skarn consisting mainly of granditic garnet, salite (to ferrosalite or/and johannsenite-rich pyroxene), wollastonite or Mn-rich pyroxenoids and formed at the contacts of magmatic (or other silicate rocks) with calcium carbonate rocks. It can replace former magnesian-skarns (in hypabyssal or subvolcanic conditions.) Typically calc-skarns may host ores of Fe, base metals, Cu, W, Mo, Be, B, U, REE.
Unique Identifiers
Mindat ID:
50151
Long-form identifier:
mindat:1:1:50151:4
GUID
(UUID V4):
(UUID V4):
11897926-0429-43b5-9e29-16599bad46db
Classification of Calc-skarn
Sub-divisions of Calc-skarn
Mineralogy of Calc-skarn
Essential minerals - these are minerals that are required within the classification of this rock:
| Garnet Group | X3Z2(SiO4)3 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Bustamite | CaMn2+(Si2O6) |
| Danburite | CaB2Si2O8 |
| Datolite | CaB(SiO4)(OH) |
| Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Ferrosalite | Obsolete name for a Fe-dominant, but Mg-rich clinopyroxene that would now classify as hedenbergite in the ... |
| Johannsenite | CaMn2+Si2O6 |
| Magnetite | Fe2+Fe3+2O4 |
| Pyroxene > Clinopyroxene > Diopside | CaMgSi2O6 |
| Pyroxene > Clinopyroxene > Hedenbergite | CaFe2+Si2O6 |
| Rhodonite | CaMn3Mn[Si5O15] |
| Scapolite | This term generally refers to just the marialite-meionite series, not the full scapolite group, ... |
| Silica > Quartz | SiO2 |
| Spessartine | Mn2+3Al2(SiO4)3 |
| Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(â—»4)â—»[Si2O7]4[(SiO4)10]O(OH)9 |
| Wollastonite | Ca3(Si3O9) |
Synonyms of Calc-skarn
References for Calc-skarn
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Fettes (et al.), Metamorphic Rocks - A Classification and Glossary of Terms (2007) Cambridge University Press
Internet Links for Calc-skarn
mindat.org URL:
https://www.mindat.org/min-50151.html
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