(WCM) Acadian Regional Metamorphism Suite -- Massachusetts
Title
(WCM) Acadian Regional Metamorphism Suite -- Massachusetts
Collection Items
Schist
aluminous
Quartz-orthoclase-garnet-biotite-sillimanite-graphite-ilmenite-pyrrhotite schist
orthoclase is concentrated in watery clear megacrysts with crushed borders
Biotite-granite-feldspar gneiss
meatmorphosed peraluminous volcanic rock
Amphibolite
cummingtonite-poor, brownish-green hornblende dominated
Quartz-orthoclase-garnet-biotite-sillimanite-graphite-ilmenite-pyrrhotite schist
high-grade metamorphism
Gneiss
cordierite-bearing
Ultramafic rock
mostly hornblende
Schist
thin oxide crust
Gneiss
coarse-grained
Pegmatite
cordierite-bearing
Garnet cordierite gneiss
contains melt-like aggregates
Schist
bedded, coarse
Sillimanite-staurolite-garnet-biotite-muscovite schist
sillimanite-rich