Reposted by kadusey
Ten years after Mineral Cup began, the mineral that began it all, quartz, is into the semi finals. Quartz is the most common SiO2 polymorph, but there are 8 other known polymorphs of SiO2 (cristobalite, tridymite, coesite, lechatelierite, moganite, seifertite, stishovite and xiexiandeite).
