A body of dolomite marble near Chotěboř was found in migmatized biotite paragneiss the Moldanubicum directly on border with migmatites/orthogneisses Kutná Hora Crystalline Complex. The area underwent significant tectonic reworking rocks along Přibyslav mylonite zone. Therefore, only small relics early prograde HT/LP metamorphism at T > 650 - 700 °C were preserved this marble. They are repres...

The metasomatised continental mantle may play a key role in the generation of some ore deposits, particular mineral systems enriched platinum-group elements (PGE) and Au. cratonic lithosphere is longest-lived potential source for these elements, but processes that facilitate their pre-concentration later remobilisation to crust are not yet well-established. Here, we report new results on petrog...

The Sedemte Prestola pluton is an intermediate to acid plutonic body of Variscan age (308.7 ± 9.1 Ma). Despite its small size, several petrographic varieties are present: syenites, quartzsyentes and granites. It composed potassium feldspar, quartz, sodic-calcic amphibole; biotite, when present, often rimmed by amphibole or strongly altered; zircon, titanite, apatite ilmenite the accessory phase...

In the present study, rough emerald single crystals and emeralds in host rock from ruins of Alexandria Mount Zabargad Egypt, preserved collection museum Ecole des Mines (Mines Paris—PSL) since late 19th or early 20th century, are investigated. All samples were characterized by non-destructive spectroscopic chemical methods during a week-long loan to LFG. Raman, FTIR UV-Vis-NIR spectroscopy reve...

Potassium sulfide KFeS2 (hanswilkeite) has been identified in polymineralic inclusions a diamond from the Udachnaya kimberlite pipe (Siberian craton, Yakutia). This is second occurrence of hanswilkeite nature and first one mantle-derived samples. Sulfide monoclinic, space group—C 2/c. Its crystal structure consists chains with K interstices. The tetrahedra are centered by iron ions linked edges...

Marbles containing high-pressure mineral assemblage was found from the Sanandaj-Sirjan metamorphic belt in the Nahavand area in western Iran.  The high-pressure marbles occur as small bodies or lenses within pelitic schist layers and show compositional banding of carbonate- and silicate- rich bands.  Textural analysis revealed two metamorphic stages.  The early stage is testified by relicts of ...