Small olivine phenocrysts

Large euhedral to subhedral olivine phenocrysts

Smaller pyroxine grains than Type II. Often with poikilitic olivine inclusions

Large, often densely packed grains of pyroxene

Small olivine and large pyroxene grains which usually poikilitically enclose olivine

Usually large olivine crystals or laths and pyroxene phenocrysts of similar or smaller size

Thin fibers or laths having grown from one or more points on the shell

Shell containing sub-parallel bars

Microcrystalline intergrowths in multiple orientations

Very small grains, sometimes surrounded by a shell of coarser grains and containing blebs of metal and sulfides