Introduction: More than 80 fossil meteorites have been found in a ~4 m quarry layer of mid-Ordovician limestone in Sweden [1, 2]. Their cosmic-ray exposure (CRE) ages correlate inversely with sediment deposi-tion age and indicate very rapid (<1.2 Myrs) transport from the asteroid belt [3]. The same layer contains up to 3 sediment-dispersed, extraterrestrial chromite (SEC) grains (>63 µm) per kg...

The production of ferrochrome alloy from chromium bearing chromite ores is conducted at high temperature under highly reducing conditions. However, albeit completely unintended, it is impossible to completely exclude oxygen from all high temperature process steps, with the corresponding possibility arising for the generation of small amounts of Cr(VI) species. Certain Cr(VI) species are regarde...

This article presents the complex processing of low-grade and substandard chromium ores, as well sludge tailings, with production composite chromium-containing materials pigments, while improving environmental performance in Republic Kazakhstan through utilization technogenic raw materials. In this work, to study physicochemical properties starting materials, modern analytical, thermodynamic, c...

The spatial distribution of mineralization is the foremost concern in regional exploration and it could be considered as a very important tool in the investigation of mineral deposits. There are several data manipulation methods by which the data can be evaluated. Fry analysis is a good method to determine the direction(s) of maximum continuity of the deposits and could be used in different typ...

Electron-probe microanalyses and scanning electron microscopy of chrornitites from some ultramafic members of Neyriz ophiolite indicate that sulifides of platinum- group minerals (PGMs) occur as solid inclusions in chromite grains. Laurite with the general formula of (Ru ,Os ,lr ) S , and erlichmanite are the main identified sulfide phases. The PGMs occur as 4 to 20 microns euhedral to rect...