macro of a mineral stone boulangerite on a black background

abstract acid agalmatolite alumite alumstone alunite andalusite architecture backdrop background barium baryte boulangerite chiastolite cluster copper crystal cyanite dickie feldspar firm fluorite geology gneiss gothite gray hematite hosanna hydrofluoric lepidolite lime marble material matrix mineral nature pattern rock rough sample solid stone stromatolite surface texture textured treasure wall wallpaper