Fig. 1: Mn mineral occurrence histogram.
From: Evidence for the oxidation of Earth’s crust from the evolution of manganese minerals
A histogram showing the number of occurrences of mineral-locality pairs as a function of geologic time for all dated Mn-bearing mineral species, with data parsed into 50 million-year bins. Colors indicate oxidation state of Mn; Red = Mn(II), Green = Mn(III), Purple = Mn(IV). Blue bands represent intervals in which Earth’s major landmasses are thought to have consolidated into a supercontinent.
