Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
Estudo Geológico-Petrográfico da Região de Viana do Alentejo-Alvito, A. Barros e Carvalhosa, Boletim da Sociedade Geológica de Portugal, Vol. XVII, Fasc. I, 1972.