Compositional data of clinopyroxene crystals standards analysed by electron probe microanalyses for major element oxides and by Mossbauer spectroscopy for iron valence and unknown clinopyroxene crystals from Iceland and the Azores . These data were collected in support of research described in the following preprints: https://doi.org/10.31223/X5CT03 and https://doi.org/10.31223/X5N959

Backscattered electron image (BSE) images of ocean island basalt samples from four volcanic systems in Iceland (Holuhraun, Skuggafjoll, Laki and Eyjafjallajokull) and two eruption sites on Pico Island in the Azores (samples PI-011 and PI-041). These samples are described in the following manuscript: Neave, David A., Alexander G. Stewart, Margaret E. Hartley, and Olivier Namur. ‘Iron Valence Systematics in Clinopyroxene Crystals from Ocean Island Basalts’. Contributions to Mineralogy and Petrology 179 (2024): 67. https://doi.org/10.1007/s00410-024-02144-x.

EPMA (Electron probe microanalysis) major element analyses of clinopyroxene, olivine, amphibole and glass from lava and tephra samples of the 2021 Tajogaite eruption. LAICPMS (Laser Ablation Inductively Coupled Plasma Mass Spectrometry) trace element analyses of selected clinopyroxene from the eruption sequence.

Major and trace elements data for whole rock and clinopyroxene; major elements data for glassy groundmasses; BSE (back-scattered electron) images of clinopyroxene; Fe-Mg elemental diffusion timescales of clinopyroxene; LA-ICP-MS chemical maps of clinopyroxene.

Mineral chemistry of volcaniclasts from IODP Site 1438 drilled during exp.351 in the Amami Basin, W.Pacific Ocean. This data includes mineral chemistry of mafic minerals determined by electron microprobe at University of Leeds.

Petrological and geochemical analysis of samples from Aluto volcano, Ethiopia. Data are referenced in Gleeson et al., 2017: Constraining magma storage conditions at a restless volcano in the Main Ethiopian Rift using phase equilibria models; https://doi.org/10.1016/j.jvolgeores.2017.02.026.