length but are mostly less than 0.4 mm. They are euhedral tabular or elongated parallel to the c crystallographic axis, showing weak zoning at the peripheral margins of each crystal. Clinopyroxene phenocrysts are much less common than those of olivine, being subhedral,short, and prismatic in form and up to 0.3 mm in length. Weak sector zoning is always seen. The groundmass is rather fine-grained and hypocrystalline with numerous vesicles