Lignite: Mineral information, data and localities.
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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%
Vitrain: Mineral information, data and localities.
Lignite - Wikipedia
Rock: Mineral information, data and localities.
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Branchite: Mineral information, data and localities.
Sedimentary rock: Mineral information, data and localities.
An open database on global coal and metal mine production
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Archaeometric evidence for the earliest exploitation of lignite from the bronze age Eastern Mediterranean
Santabarbaraite - Wikipedia
Amethyst: Mineral information, data and localities.
Full article: Tennessee Mineral Locality Index
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Ferro-kaersutite: Mineral information, data and localities.
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