Macraeite is the fourth type mineral to be described from the Mangualde pegmatite, Portugal, and is the first paulkerrite-group mineral to be characterised from the locality. Its crystal structure has been refined using synchrotron diffraction data, and its chemical analysis, Raman spectrum, and optical properties are reported.

We studied primary granitic and halogen-rich melt inclusions trapped in mantle rocks in the Bohemian Massif (Germany) in order to retrieve important information about the nature of the melt and the source rock. The melt was produced by the partial melting of metasediments during the deepest stages of subduction and interacted with the mantle. This work is an excellent example of transfer of crustal material, volatiles in particular, in the mantle during the subduction of the continental crust.

The first lanthanum-dominant mckelveyite group mineral, alicewilsonite-(YLa), Na₂Sr₂YLa(CO₃)₆∙3H₂O, was found at the Paratoo copper mine, South Australia, Australia.

We described two new minerals, igelströmite and manganoschafarzikite, from the Långban manganese–iron deposit in Värmland, Sweden. The chemical formulae are Fe³⁺(Sb³⁺Pb²⁺)O₄ and  Mn²⁺Sb³⁺₂O₄, respectively. They belong to a new mineral group, where all members have the same crystal structure. It is called the minium group, after the lead-oxide mineral that is the oldest known substance of this kind.

The manganese-rich siliceous metasediment in the Antarctic Ross orogen most likely originated from Mn-nodule-bearing chert deposited not earlier than ca. 546 Ma. Subduction-related metamorphism resulted in the production of highly oxidized assemblages involving Mn³⁺ and rare-earth-element-zoned epidote-group mineral and Mn²⁺-rich garnet. A reduced environment was responsible for the Mn olivine-bearing assemblages from silica-deficient composition.

The paper documents sillimanite gneiss in the Western Gneiss Region (WGR) and its presence, composition, formation and metamorphic evolution. Peak metamorphism is modelled to T = 750 °C and P around 0.6 GPa. Subsequent retrogression consumes garnet and shows mineral replacement and melt crystallization involving sillimanite, white mica, K-feldspar and quartz. The petrological evolution is in accordance with the investigated eclogites and HP granulites in the northwestern part of WGR.

The mineral tourmaline records the geologic environment in which it crystallizes. Methods were developed for laser-induced breakdown spectroscopy analysis of tourmaline. Problems that were solved include the spacing between analysis locations to avoid the recast layer from previous analyses, the efficacy of using cleaning shots prior to data acquisition, the number of analyses needed to obtain a representative average analysis, and the effect of spectrometer drift on multivariate analysis.