| Text Description: |
Light-gray (N7) olivine basalt, compact, holocrystalline, porphyritic, with intergranular texture. The larger plagioclase crystals, ranging in width from 0.1 to 3 mm have a median composition, judging from the refractive index, of about An[63?]. Salite phenocrysts ranging in size from 0.1 to 5mm, have nZ 1.723, suggesting a composition of Ca50Mg27Fe23. The olivine crystals which range in size from 0.5 for 0.07 mm, have Nz 1.72, suggesting F076Fa24. Magnetite of ilmenite, in irregular grains, from 0.5 to 0.1 mm, is the principal accessory. The groundmass consists of plagioclase laths, with median composition from An37 to An15, with interstitial augite and magnetite or ilmenite grains, and partial outer rims of orthoclase on the plagioclase laths |