We’re starting off the competition with beloved clay favourite Kaolinite and newcomer quirky porphyrin Abelsonite. Many-times-competing ubiquitous clay Kaolinite is in everything from paper to kitty litter, a soft mineral formed all over the world given enough time and water. Meanwhile, Abelsonite is still challenging scientists to understand exactly how it forms, straddling the boundaries between biology and geology that was discovered under a century ago and first synthesized even more recently. Which one gets your vote?

Voting for each match starts and ends at 06:00 GMT. Due to site limitations, the polls will continue to be visible until manually closed by volunteers, but only votes cast in the 24-hour period will be tallied.