The alteration of two trioctahedral micas, biotite and phlogopite, was investigated at the meso, micro, nanoscale using three complementary microscopy techniques to better understand mica surface reactivity. In situ ex experiments were performed monitor mineral interface during dissolution in acidic solutions (nitric oxalic acid, pH ∼ 1–2), over a temperature range 25–100°C. inorganic acid used...

The paper provides results of a detailed mineralogical study some chromitite ores from two deposits in the Southern Urals Kazakhstan: Almaz-Zhemchuzhina and Geofizicheskoe-VII. It is revealed that main ore minerals are Cr-spinel with high Cr# (Cr/(Cr + Al) = 0.8–0.83), as well serpentine chlorite, replacing primary olivine. Chromium spinel grains contain mineral inclusions, which distributed ra...