set of various brown unpolished rocks with names

almandine almandite andradite background basalt bauxite bronzite cassiterite coal collage collection cutout description gemstone goethite granite iron isolated lamprophyllite limonite mahogany mica mineral morion muscovite name natural nepheline normandite obsidian ore orthoclase peat phlogopite pumice quartz raw rock rough set siderite smoky sphene stone syenite tagamite titanite turf unpolished various white wolframite