Of, pertaining to, or composed of an amphibolite.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "amphibolitic" in a sentence
"It said the qualified person for the project has notified Brookemont that crews have uncovered a 4.5 km trend of gold related arsenic geochemistry anomaly, with visible arsenopyrite in amphibolitic gneiss with quartz veining cutting across the property."