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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.
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:
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
|Feldspar > Plagioclase||A petrological term for Albite-Anorthite Series.|
|Ferrosalite||Obsolete name for a pyroxene that would now classify as hedenbergite in the current pyroxene nomenclature.|
|Pyroxene > Clinopyroxene > Diopside||CaMgSi2O6|
|Pyroxene > Clinopyroxene > Hedenbergite||CaFe2+Si2O6|
|Scapolite||This term generally refers to just the marialite-meionite series, not the full scapolite group, ...|
|Silica > Quartz||SiO2|
Accessory minerals - these are minor components, often far less than 1% of the total mineral material: