In this work, we refine the crystal structure of childrenite. Additionally, we provide compositional data to substantially extend the published solid-solution series between childrenite and eosphorite, the Fe and Mn endmembers, respectively. We analyze the valence state of iron to avoid erroneous classification of ernstite or potential discovery of "oxychildrenite", a mineral species not yet confirmed to be stable in nature.

We investigate the occurrence, texture, composition, and chronology of three types of zirconolite in dolomite marbles from the Mogok metamorphic belt, Myanmar. These zirconolites, which were formed by multiple episodes of fluid–marble interaction, record the time-resolved fluid infiltration history in metacarbonates and reactive fluid compositions from ~35 to ~19 Ma. Zirconolite is expected to play a more important role in orogenic CO₂ release and the transfer and deposition of rare metals.

Minerals formed by weathering of toxic materials, of either natural or human origin, act as storage containers for toxic elements. In this work, we investigated properties of common minerals which store and release arsenic in the environment. The data presented here will allow for improved modeling of the polluted sites and for better remediation strategies that could be applied to minimize the impact of the pollution on the environment.

X-ray absorption spectroscopy (XAS) was successfully used to investigate the atomic-scale environment of niobium (Nb) in ore minerals and Nb-doped compounds of technological importance. The demonstrated sensitivity of this technique to Nb minerals could help decipher Nb speciation in mining contexts such as hydrothermal and lateritic deposits and rationalize the origin of the enhanced physico-chemical properties of Nb-doped materials.

We report the description and the characterization of a new mineral species, found in a rock sample from the geological formation called the Pilanesberg Complex, South Africa. This is a silicate mineral that contains a significant amount of sodium, calcium, iron, titanium and fluorine. Its atomic structure shows that it is related to other wöhlerite-group minerals. This work provides new insights into the crystallization conditions that ruled the formation of the Pilanesberg complex.

The paper proposes an application called OxyEMG (Oxyspinel group End-Member Generator), which is an improved version of EMG. This tool allows for calculating the portions of 31 end-members of the oxyspinel group from data obtained with an electron microprobe. This is fundamental since this group of minerals is considered to be tectonic tracers; their integral composition should be taken into account and not only those end-members that make up the magnetite or ulvöspinel prisms.

Petrological and mineralogical studies of mica schists, orthogneisses and glaucophane eclogites from Dumet Island (Armorican Massif, NW France) indicate that this occurrence, which has undergone high-pressure metamorphism up to 16 kbar and 620 °C, is similar to that of Groix Island. There are about 10 similar occurrences within the Ibero-Armorican Arc, forming a discontinuous high-pressure belt, but most of them have remained unnoticed due to a high degree of retrogression.

I review investigations of melt inclusions in lunar rocks in the last 53 years. They can be divided into two stages. In the first stage (1970s), melt inclusion studies focused on major oxides and magma evolution, including the discovery of silicate liquid immiscibility. In the second stage (since 2010), melt inclusion studies have provided key constraints on water and other volatiles on the Moon and have been instrumental in the paradigm shift from a “bone-dry” Moon to a fairly wet Moon.

This is the first successful synthesis of jadarite, a Li–B ore mineral. Synthetic jadarite was characterized by powder X-ray diffraction, Fourier transform infrared, Raman, and Li and B K-edge X-ray absorption near-edge structure. The results are evaluated by first-principles theoretical calculations. Our findings for jadarite in sediments derived from Li-rich alkaline brines under high-temperature diagenetic conditions have implications in the search for new Li–B deposits in sedimentary basins.

The new mineral heimite was originally discovered on the mine dumps of the Grosses Chalttal deposit, Mürtschenalp district, Glarus, Switzerland. Its relatively simple chemistry is formed by water and ions of lead, copper, arsenic, hydrogen and oxygen. The mineral's crystal structure is related to the well-known duftite, which is also observed to grow on crystals of heimite. While heimite has so far only been found in the central Alps, it is expected to occur in other copper deposits worldwide.

Boron is a common additive in industrial glasses used for a wide variety of applications and in experimental degassing studies regarding exoplanet atmospheres. It is therefore important to constrain the behavior of this component in the melt phase. For this reason we investigated experimentally the evaporation of B₂O₃ from Ca- and Mg-bearing aluminoborosilicate melts at different temperatures, as a function of time and oxygen fugacity.

The new mckelveyite group mineral bainbridgeite-(YCe) was found at Mont Saint-Hilaire, Quebec, Canada.

The new spectroscopic method, based on the syncrotron radiation, allows for determination of Fe oxidation state in tiny objects or in heterogeneous samples. This technique is expected to be an important tool in geosciences unraveling redox conditions in rocks and magmas as well as in material sciences providing constraints on material properties.

The acid igneous rocks of eastern Croatia related to the Late Cretaceous closure of the Neotethys Ocean contain zircon as a main accessory mineral. Among others, zircon has inclusions of anatase, hematite and melt (nanogranitoids) with kokchetavite and kumdykolite. The first finding here of kokchetavite and kumdykolite in a magmatic nanogranitoid proves that these are not exclusively ultra-high pressure phases. The detected inclusions indicate rapid uplift and cooling of the oxidised magma.

Models for the generation of silicic magmas are divided into two groups: intra-crustal melting and basaltic origin. Peraluminous felsic leucogranites are considered as the only granite examples showing no mantle input. This interpretation is re-evaluated, and we show that leucogranites, as most other crustal granite types, can have a mantle filiation. This stresses the critical importance of the mantle for granite generation and opens the way for unification of silicic magma generation models.

To explore the compositional constraints on Cl incorporation into amphiboles, which can be used to characterize transient brines, amphiboles were synthesized with a broad range of Cl concentrations. Amphibole Cl was found to be dependent on the Fe^2+,3+ content, but not the tetrahedral Al content or K / Na ratio. Cl incorporation was found to contract the unit cell along a and expand it along b and c. Molar volumes were derived for endmember Cl-amphiboles using multivariate regressions.