Lignite: Mineral information, data and localities.

A consolidated, dull, soft brown to black coal with visible plant fragments set in a finer grained matrix. 60-75% carbon content dry ash free, 46-63%

Mellite: Mineral information, data and localities.

Lignite, Uses, Formation, Properties

Coal: Mineral information, data and localities.

Voltaite: Mineral information, data and localities.

Lignite - Wikipedia

Coal: Mineral information, data and localities.

Applied Sciences, Free Full-Text

Simonellite: Mineral information, data and localities.

Carbuncle: Mineral information, data and localities.