Porphyritic (alkalic feldspar) biotite granite

Porphyritic (alkalic feldspar) biotite granite.
State New Hampshire
Name Porphyritic (alkalic feldspar) biotite granite
Geologic age Late Ordovician
Lithologic constituents
Igneous > Plutonic > Granitic > Granite (Pluton)Porphyritic (alkalic feldspar) biotite granite.
Comments Part of the Oliverian Plutonic Suite (Late Ordovician) - Pink, weakly to moderately foliated, locally porphyritic biotite granitoids found in mantled gneiss domes. Mafic varieties contain hornblends. Variably metamorphosed up to amphibolite facies.
NGMDB product
Counties Coos - Grafton