Origin and occurrence of gem-quality, skarn-hosted barite from Jebel Ouichane near Nador in Morocco.

Light-blue barite from Jebel Ouichane in Morocco forms blade-like tabular crystals (up to ca. 10 cm) with superb transparency and lustre and represents one of the most spectacular gem-quality worldwide. The barite is hosted by iron-ore-bearing skarns, developed within Jurassic-Cretaceous limestones, and occurs in close spatial association with calcite.

Raman spectroscopy of organic matter and rare minerals in the Kłodawa Salt Dome (Central Poland) cap-rock and Triassic cover - Indicators of hydrothermal solution migration.

The occurrence of organic matter (OM) in a salt dome cap-rocks is very rare in Zechstein formation in the Europe. Within the Kłodawa Salt Dome (KSD) cap-rock and Triassic cover OM occur relatively often and it is accompanied by some rare minerals. The OM in cap-rocks occurs in two forms i.

Raman spectroscopy of organic, solid and fluid inclusions in the Oldest Halite of LGOM area (SW Poland).

Raman spectroscopy was applied to determine the degree of recrystallization and the influence of the secondary solution migration on the Oldest Halite (Na1) in Lubin-Głogów Copper District (LGOM). Numerous organic matter (OM) inclusions which generally show weak structural ordering was found in halite crystals. In this context they are similar to solid bitumens or carbonaceous matter of low thermal alteration.

Raman spectroscopic and microthermometric studies of authigenic quartz (the Pepper Mts., Central Poland) as an indicator of fluids circulation.

Differently colored authigenic quartz crystals were found as the druses compound within mudstone heteroliths from the Pepper Mts. Shale Formation (Cambrian unit of the Holy Cross Mts., Central Poland).