Ice, a "dark horse" candidate, has been voted as the winner of the third annual Mineral Cup. Courtesy of Francis Sia.

If you’ve spent any time in September lurking around the corner of the internet known as “Geology Twitter”, you’ve probably seen a lot of back and forth – some of it heated - on the relative merits of minerals. The reason? The Mineral Cup, a head-to-head single elimination tournament to determine mineral supremacy