Raw black coal lump, showing rough texture. Symbolizes industrial energy and environmental concerns.
Keywords
coal,
anthracite,
bituminous,
lignite,
stone,
peat,
fossil fuel,
energy,
black,
rock,
mineral,
natural,
raw,
unrefined,
power,
fuel,
industry,
mining,
resource,
solid,
carbon,
heat,
electricity,
combustion,
pollution,
environment,
geologic,
formation,
deposit,
sedimentary,
organic,
dark,
dense,
heavy,
rough,
textured,
earthy,
industrial,
raw material,
fossil