Abstract Beryl from Xuebaoding, Sichuan Province, western China is known for its unusual tabular habit and W–Sn–Be paragenesis in a greisen-type deposit. The crystals are typically colourless transparent to pale blue, often with screw dislocations of hexagonal symmetry on the (0001) crystal faces. Combining electron microprobe analyses laser ablation inductively coupled plasma mass spectrometry...

The Silurian Pelplin Formation is a part of thick, mud-prone distal fill the Caledonian foredeep, which stretches along western margin East European Craton. consists organic carbon-rich mudstones that have recently been target intensive investigations, as they represent potential source shale gas. host numerous calcite concretions containing authigenic pyrite and barite. Mineralogical and petro...

This study encompasses the ore mineralogy, textures and sulphide trace element chemistry of Palaeoproterozoic Lovisa stratiform Zn-Pb deposit stratigraphically underlying Fe Formation in Bergslagen province (Sweden). We investigate relative timing formation subsequent modifications its ores relation to c. 1.87–1.80 Ga Svecokarelian orogeny. The consists several different types. massive sphaleri...

The petrological features of scoria samples and enclosed holocrystalline xenoliths from the last ~1000 years activity La Soufrière volcano St. Vincent (Lesser Antilles) are described in detail here. products investigated prehistoric eruptions (pre-1440, 1440, 1580 CE) relatively homogeneous basaltic andesites (with a paragenesis consisting plagioclase, clinopyroxene, orthopyroxene opaques) comm...

Alongside volcanic eruptions in the middle and late Permian, sedimentary environment process changed, lithofacies mineralogical characteristics varied conspicuously from marine sediments this period. Marine tuffaceous rocks beared strong witness to actions time. With experimental studies relying on field outcrop, thin section, scanning electron microscope, X-ray diffraction (XRD), mercury injec...