Pigotite (type locality) on granite matrix - Chapel Port, St. Levan, Cornwall, UK
 
Pigotite as red-brown glassy sinter on granite matrix (stabilized with acrylic resin). Good reference specimen, recovered in June 2019 from a sea cave. Chapel Porth is type locality for this rare, Mellite-related organic mineral, Al8(C12H10C20) • 27 H2O (cf. extraLapis No.57, 2019, S.124-125)