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Abelsonite, a C31 nickel-porphyrin of the deoxophylloerythroetioporphyrin type, is shown to have methyl groups in the 2, 3, 7, 12, and 18 positions and ethyl groups in the 8 and 17 positions by high-resolution, high-field 1H nuclear magnetic resonance and nuclear Overhauser effect studies.— (https://www.science.org/doi/10.1126/science.223.4640.1075)
The crystal structure of the unique nickel porphyrin mineral abelsonite, NiC31H32N4, has been solved using direct methods with 2195 independent reflections to a final R1 = 0.0406. Abelsonite crystallizes in the triclinic space group, with Z = 1 and unit-cell parameters a = 8.4416(5) Å, b = 10.8919(7) Å, c = 7.2749(4) Å, α = 90.465(2)°, β = 113.158(2)°, and γ = 78.080(2)° at the measurement condition of 100 K, in very good agreement with previous unit-cell parameters reported from powder diffraction.— (https://pubs.geoscienceworld.org/msa/ammin/article-abstract/102/5/1129/286888/Crystal-structure-of-abelsonite-the-only-known)
Occurrence and localities In the eight localities (Table l), all in Uintah County, northeastern Utah (Fig. I ), abelsonite is present as macroscopically crystallized aggregates of platy crystals. All the samples were found in or nearthe Mahogany Zone, probably in the lower part (W.B. Cashion, U.S. Geological Survey, personal communication, May ll, 1976). The Mahogany Zone is the subsurface equivalent of the kerogen-rich Mahogany Ledge in the Parachute Creek member of the Green River Formation. Pink platy abelsonite was found in one sample (Wosco; the type locality) at a depth of 2508 ft.— (American Mineralogist, Volume 63, pages 930-937 ,1978 Abelsonite, nickel porphyrin' a new mineral from the .Green River Formation, Utah→ lire en ligne)
