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Calc-skarn

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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.


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Classification of Calc-skarnHide

Sub-divisions of Calc-skarnHide

Mineralogy of Calc-skarnHide

Essential minerals - these are minerals that are required within the classification of this rock:
Garnet GroupX3Z2(SiO4)3
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
BustamiteCaMn2+(Si2O6)
DanburiteCaB2Si2O8
DatoliteCaB(SiO4)(OH)
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
FerrosaliteObsolete name for a pyroxene that would now classify as hedenbergite in the current pyroxene nomenclature.
JohannseniteCaMn2+Si2O6
MagnetiteFe2+Fe3+2O4
Pyroxene > Clinopyroxene > DiopsideCaMgSi2O6
Pyroxene > Clinopyroxene > HedenbergiteCaFe2+Si2O6
RhodoniteMn2+SiO3
ScapoliteThis term generally refers to just the marialite-meionite series, not the full scapolite group, ...
Silica > QuartzSiO2
SpessartineMn2+3Al2(SiO4)3
Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
WollastoniteCaSiO3

Synonyms of Calc-skarnHide

References for Calc-skarnHide

Reference List:
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Fettes (et al.), Metamorphic Rocks - A Classification and Glossary of Terms (2007) Cambridge University Press

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