Browse Items (3 total)

Hand Specimen Sedimentary textures, very poorly sorted. Sub-round to angular grains up to 20mm across. Wide variety of clasts: dark purple, cream, rusty orange, grey, several types of lava. Some black, shiny igneous crystals. Brown-grey…

Hand Specimen Black, porphyritic rock comprising black clinopyroxene, grey feldspar and greenish olivine phenocrysts, in a fine-grained groundmass. Thin-section Plagioclase feldspar - Phenocrysts 1-4mm long, with a…

Hand Specimen Fine-grained, greenish black rock comprising dark and white minerals. Contains amygdales, mostly white, though some have black cores. Thin-section Fine-grained plagioclase laths and irregular clinopyroxene…