NamePorphyritic Basalt
TexturePorphyritic
OriginExtrusive/Volcanic
Chemical CompositionMafic
ColorDark Gray to Black
Mineral CompositionCalcium Plagioclase, Pyroxene
MiscellaneousCalcium Plagioclase phenocrysts in an aphanitic (Fine-grained) groundmass
Tectonic EnvironmentDivergent Boundary or Intra-oceanic hot spots

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