Figure F219. Basalt of Unit 1256D-70, showing hypocrystalline intersertal texture with variolitic domains. These are characterized by branching aggregates of acicular to fibrous plagioclase, often intergrown with prismatic or acicular dentritic clinopyroxene (Thin Section 12; Sample 312-1256D-176R-1, 133–136 cm) (field of view = 4.8 mm; plane-polarized light).
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