… indelible brown of burnt umber acid lava scheele’s green salt gem cobalt blue golden yellow mica schist andesite anthracite basaltic lava sienna golden peat shell ivory lignite grey cinnabar gravel white barite violet pebbles red limestone carmine pyroxene light blue laterite obsidian turquoise orange microlites beige pegmatites greyish-beige granulites pink sima cassel’s ash orange mine blue mineral mauve chalcedony black potash lemon-yellow rhyolite amphibole orbicular coral ocean blue lilac grey green corals golden pink rock crystal silver nife dark mahogany brown sial red marlstone yellow fawn-coloured flint ceruleum blue sea fauna silica yellow laterite tyrian mud pit-coal mexican yellow emerald green coal apricot alabaster ivory black loess iron minium honey bunter sandstones vermilion mica flakes pink pumice blazing fire red vitreous rocks indian yellow bluish ashen white lead amber unutterable transparency…