Interactions between minerals and water are fundamental to many geological processes on Earth, in meteorites, and on other planetary bodies, for instance, in the development of plate tectonics. In this study, we experimentally determine how quickly hydrogen isotopes are exchanged between minerals and fluids. We then explore how exchange rates can inform us about past interactions between rocks and water on the Earth and in meteorites using hydrogen isotope measurements in natural minerals.

Natural ruby and sapphire are of the rarest gemstones. To further enable their identification from synthetic analogues, this study explores secondary ionization mass spectrometry (SIMS) oxygen isotope analysis. SIMS δ¹⁸O analysis of hydrothermal corundum yielded values between -7.84 ± 0.13 ‰ and -14.54 ± 0.13 ‰ (Vienna Standard Mean Ocean Water), which are atypical for natural corundum. SIMS δ¹⁸O analysis of corundum thus has strong potential to distinguish synthetic and natural corundum.

Iron sulfides are ubiquitous minerals of sedimentary environments. Several research works consider it to be that they preserve evidence of their original deposition environment, allowing us to derive paleo-environmental information. However, linking environmental factors to final mineralogy requires gaining mechanistic-level information about their formation pathways. Here, we propose a mackinawite to greigite "corrosion" pathway, with H+ acting as an oxidant.

Delchiaroite is the first iodide–methanethiolate mineral and represents an interesting example where organic chemistry meets mineralogy.

Friisite is a newly identified mineral, with the chemical formula Pb₈Al₃Si₈O₂₇Cl_3, from the Långban mine in Sweden, found as tiny, white, flaky grains within a skarn matrix alongside jagoite and other silicates. It has a sub-adamantine luster, perfect basal cleavage, a hardness of 4–5, and a high density of 5.54 g cm⁻³. Structurally it is a hexagonal phyllosilicate, closely related to jagoite in a polysomatic series. The mineral is named in honor of Danish mineralogist Henrik Friis.

Gabbroic rocks from the Southwest Indian Ridge have been investigated. The results show that hydrous partial melting triggered by hydrothermal fluids percolating on grain boundaries above the wet gabbro solidus is a common process at slow-spreading mid-ocean ridges. The main indication of this process is plagioclase strongly enriched in anorthite content at grain boundaries, which can only be identified via backscattered electron imaging and related electron microprobe profiles.