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Amphibolite

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Amphibolite is a gneissose or granofelsic metamorphic rock mainly consisting of green, brown or black amphibole and plagioclase (including albite), which combined form ≥75% of the rock and both of which are present as major constituents; the amphibole constitutes ≥50% of the total mafic constituents and is present in an amount of ≥30%.
The original rock (protolith) is usually a basaltic or doleritic rock, but may be a tuffaceous or calcareous sediment.


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Classification of AmphiboliteHide

Sub-divisions of AmphiboliteHide

Mineralogy of AmphiboliteHide

Essential minerals - these are minerals that are required within the classification of this rock:
AmphiboleAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Epidote GroupA2 M3(Si2O7)(SiO4)O(OH)
GarnetX3Z2(SiO4)3
Mica > BiotiteA series or subgroup of the Mica Group.
Pyroxene > ClinopyroxeneA petrological term for Clinopyroxene Subgroup.
ScapoliteThis term generally refers to just the marialite-meionite series, not the full scapolite group, ...
Silica > QuartzSiO2
TitaniteCaTi(SiO4)O

References for AmphiboliteHide

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

Internet Links for AmphiboliteHide

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