For today’s deskcrop I present the type specimen of centerlinite. Closely related to asphaltite (and its derivative products), it is distinguished from other minerals by its distinctive taxicab yellow color on top (below), though remarkably similar to other minerals of the group on the bottom (2nd photo below). Usually found as a surface encrustation on Quaternary (Anthropocene) asphalt deposits, centerlinite can only be considered a mineral if you’re not especially picky about the “naturally occuring” part of the mineral definition, as all known samples appear to be anthropogenic. Further work will be necessary to establish the color causing mechanism of its distinctive top side.
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