Porphyritic granite

Gray to gray-green, seriate to porphyritic biotite granite containing clots and streaks of biotite, epidote, and sphene. Mafic inclusions common. Gneissic in New Bedford area. Intrudes Zgs.
State Massachusetts
Name Porphyritic granite
Geologic age Proterozoic Z
Lithologic constituents
Major
Igneous > Plutonic > Granitic > GraniteGray to gray-green, seriate to porphyritic biotite granite containing clots and streaks of biotite, epidote, and sphene. Mafic inclusions common. Gneissic in New Bedford area.
Comments Part of Milford-Dedham Zone (Tertiary and Older Rocks)
References
NGMDB product
Counties Bristol - Plymouth