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angular shapes, black mineral, black stones, chunks, close up, crystal structure, crystals, earth materials, earth sciences, environmental study, geological study, geology, geology enthusiasts, geology fieldwork, hard materials, igneous rocks, metallic minerals, mineral collection, mineral deposits, mineral identification, mineral properties, mineral specimens, mineral textures, mineralogy, mining, natural elements, natural history, natural resources, raw materials, rock collection, rock formation, rock types, scientific study, shiny minerals, shiny surfaces, solid materials, specimen display, stones, surface detail, texture,