[5] In 1967, unaware of the earlier description, Joseph Murdoch analyzed and described a specimen from the Picacho Peak area of San Benito County, California and named it "pendletonite".

This "corrugated layer" structure is highly resistant to intercalation, which apparently explains the purity of the mineral.

[3] In the Ukraine discovery location, carpathite occurs at the contact zone of a diorite intrusive into argillite within cavities, and is associated with idrialite, amorphous organic material, calcite, barite, quartz, cinnabar, and metacinnabar.

[5] In the California location, it occurs in centimeter-size veins, associated (and somewhat contemporaneous) with quartz and cinnabar, in a silicified matrix.

[2] Carbon isotope ratios and the morphology of the deposit indicate that the coronene was produced from organic matter in oceanic sediment, thermally decomposed, purified through hydrothermal transportation and chemical reactions, and deposition below 250 °C, after the other minerals in the intrusion.