Rock | Amphibolite | Hornblende and plagioclase | Metamorphic
Amphibolite forms when mafic rocks undergo metamorphism producing hornblende-rich textures. Found as glacial erratics from metamorphic belts.
Amphibolite Displays These Colors
Black | Green | Gray
Amphibolite is Found in These Surrounding States
Ohio | Indiana | Kentucky | West Virginia | Pennsylvania | Michigan