Texture: Porphyritic

Orgin: Extrusive/Volcanic

Chemical Composition: Mafic

Color: Dark Gray to Black

Mineral Composition: Calcium Plagioclase, Pyroxene

Miscellaneous: Calcium Plagioclase Phenocrysts in an aphanitic (fine-grained) groundmass

Tectonic Environment: Divergent Boundary or Intra-oceanic hot spots