A suite of clinopyroxenes from ankaramitic magmas of the Miocene Teno massif and Roque del Conde shield volcanoes (Tenerife, Canary Islands) were studied to obtain geothermobarometric information on the anatomy of the volcano plumbing system.

A new rare-earth-bearing silicate is described from a manganese ore deposit in the Pyrenees. It belongs to the epidote family and is characterised by the formula Mn²⁺Ce(MgAlMn²⁺)(Si₂O₇)(SiO₄)F(OH).  This new mineral commonly contains inclusions of an Mn-rich yttrium borosilicate, a potentially new mineral of the hellandite family. This is a new type of occurrence for hellandite – while rare earths are under the spotlight.

Karlseifertite is a new member of the dussertite group of the alunite supergroup from Tsumeb, Namibia. It is the first member of the dussertite group to be described based upon valency-imposed double site occupancy in the octahedrally coordinated cation site. It is also the first member of the alunite supergroup containing essential Ge. 

The As₄S₆ molecule was missing in the reported structures of crystalline As chalcogenides. Here we report the first occurrence of the As₄S₆ molecule together with the other known As₄S_n (n = 3, 4, 5) molecules randomly replacing each other in the crystalline structure of a new monoclinic product obtained by the light-induced alteration of the mineral alacranite, As₈S₉.

Rotherkopfite is the first member of the neptunite group that does not contain lithium in its chemical formula. It was found at Rother Kopf, Eifel volcanic fields, Germany, where in occurs in cavities in a quartz–sanidine fragment embedded in a volcanic rock. Rotherkopfite occurs as dark brownish-red crystals, up to about 0.2 mm across. The intriguing crystal structure is based on two interwoven three-dimensional frameworks.