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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%. A crystalloblastic rock consisting mainly of amphibole and plagioclase with little or no quartz. As the content of quartz increases, the rock grades into hornblende plagioclase gneiss.
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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De Vore, G. (2003): Amphibolite. In: Encyclopedia of Sediments & Sedimentary Rocks (Ed. Middleton, V.). Springer. 593-594
Fettes et al. (2007): Metamorphic Rocks - A Classification and Glossary of Terms. Cambridge University Press, xx pp.
Klaus K.E. Neuendorf, James P. Mehl, Jr., and Julia A. Jackson (Editors) (2017): Glossary of Geology. Fifth REVISED edition. American Geological Institute (abbreviated as AGI).

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