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Magnesian-skarn

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A high-temperature skarn rock containing forsterite, diopside, spinel, periclase, clinohumite, phlogopite, pargasite and formed at the contacts of magmatic and calci-magnesian or magnesian carbonate rocks. Typically these rocks may also host ores of iron, base metals, Cu, Au, Fe-Mg-borates and phlogopite.


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Classification of Magnesian-skarnHide

Sub-divisions of Magnesian-skarnHide

Mineralogy of Magnesian-skarnHide

Essential minerals - these are minerals that are required within the classification of this rock:
ClinohumiteMg9(SiO4)4F2
Mica > PhlogopiteKMg3(AlSi3O10)(OH)2
Olivine > ForsteriteMg2SiO4
Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
PericlaseMgO
Pyroxene > Clinopyroxene > DiopsideCaMgSi2O6
SpinelMgAl2O4
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
BruciteMg(OH)2
CalciteCaCO3
ChloriteA name commonly used for undifferentiated members of the chlorite group.
CorundumAl2O3
DellaiteCa6Si3O11(OH)2
DolomiteCaMg(CO3)2
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
FoshagiteCa4(Si3O9)(OH)2
KotoiteMg3[BO3]2
LudwigiteMg2Fe3+(BO3)O2
MagnesiteMgCO3
MagnetiteFe2+Fe3+2O4
MerwiniteCa3Mg(SiO4)2
MonticelliteCaMgSiO4
Pyroxene > Orthopyroxene > EnstatiteMgSiO3
SerpentineA group of phyllosilicate minerals.
SpurriteCa5(SiO4)2(CO3)
SuaniteMg2[B2O5]
TalcMg3Si4O10(OH)2
ÅkermaniteCa2Mg(Si2O7)

References for Magnesian-skarnHide

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

Internet Links for Magnesian-skarnHide

Mineral and/or Locality  
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