Every planet and moon experiences mineral evolution—a change in the diversity and distribution of minerals through billions of years of physical, chemical, and (in the case of Earth) biological processes (Zhabin 1981; Hazen et al. 2008; Hazen and Ferry 2010). A question often pondered in this context is whether minerals exist somewhere in the cosmos that are not found on Earth? As Maynard-Casely et al. (2018, this issue) have elegantly shown, one needs look no farther than Saturn's moon Titan for the answer—a resounding “Yes!” They paint a vivid picture of a frozen world perpetually...

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