"168-1031A-6X-01 (piece 6, 24-28 cm)" ROCK NAME: Aphyric plagioclase-pyroxene-olivine basalt GRAIN SIZE: Microcrystalline to cryptocrystalline TEXTURE: Intersertal; microglomeroporphyritic; sheaf-spherulitic; vesicular PRIMARY MINERALOGY PERCENT PRESENT PERCENT ORIGINAL SIZE (mm) COMPOSITION MORPHOLOGY COMMENTS PHENOCRYSTS Olivine 0 2 0.3-0.5 Euhedral Completely pseudomorphed by celadonite + iddingsite. Plagioclase 0.4 0.4 0.6-1.0 (Ave 0.8) Subhedral to skeletal "Laths, stubby crystals and some quench crystals. Most are elongate laths occurring singly, in rare glomeroporphyritic clots and in plagioclase clusters." Clinopyroxene 0.2 0.2 0.3-0.6 (Ave 0.35) Subhedral to anhedral Mostly in bimineralic glomeroporphyritic clots (plag + px). Some occur attached to plagioclase laths. GROUNDMASS Plagioclase 11.2 11.2 0.05-0.5 (Ave 0.4) Euhedral to skeletal Microlaths and microlites. Most are swallowtail and hollow quench crystals. Clinopyroxene 9.6 9.6 0.1-0.3 Euhedral to anhedral Equant grains to short prisms; occur singly or intergrown with plagioclase microlites. Opaques 1.4 1.4 0.01-0.025 Euhedral to anhedral Granular; interstitial in the mesostasis. Mesostasis 72.2 75.6 Gray; sheaf-spherulitic; consists mostly of cpx and opaque microgranules and fibers. SECONDARY MINERALOGY PERCENT REPLACING/ FILLING COMMENTS: Saponite 1 Vesicles Not abundant; absent in gray interior. Occurs inside of celadonite linings of vesicles in the alteration halo. Celadonite 0.8 Vein; vesicles; mesostasis; olivine Restricted to the alteration halo. Zeolites 0.2 vesicles; vugs; mafic phenocrysts "Isotropic to near isotropic, colorless; radial splays are fine, to fibrous to columnar. Fills vesicles and replaces euhedral mafic crystals associated with plagioclase phenocrysts and in glomeroporphyritic clots." Pyrite/pyrrhotite Tr Mesostasis "0.02-0.04mm granular, interstitial grains sparsely mark the internal edge of the alteration halo." Iddingsite 3 Veins; vesicles; mesostasis; olivine "Heavily developed in the alteration halo, equivalent to c.1-20% (visual estimate)." VESICLES/ CAVITIES PERCENT LOCATION SIZE (mm) FILLING SHAPE COMMENTS: Gas vesicles 1.6 Even 0.05-0.6 Variable Round to irregular "Filled by celadonite/iddingsite +/- saponite in alteration halo, and empty or filled (partially to completely) by zeolite in the gray rock interior." COMMENTS: