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Sulphides

Sulphides

10 items

Close-up of a gneiss with shiny black mica flakes in streaks, white and cream feldspar grains, pale gold metallic patches and silvery graphite flakes. — Sulphide and graphite-rich gneiss Sophie Graul

Two polished rock slabs, each showing a dark black band next to an olive-green granular zone grading into white crystalline marble with dark grains. — Contact aureole between tonalitic melt and diopside marble, Precambrian basement of Estonia Sophie Graul

Close-up of a pale silvery metallic patch filling a crack among dense, spiky black flakes of mica and graphite in a dark rock. — Deformed pyrrhotite associated with graphite in Estonian Precambrian gneisses Sophie Graul

Close-up of a pink and a darker purple-red garnet crystal surrounded by shiny black mica flakes and brassy metallic grains, set in white granular rock. — Almandines in a migmatite paragneiss from West Finland Sophie Graul

Polished section of a dark rock: rounded black chromite masses separated by a grey network veined with bright orange, red and yellow patches and thin white cracks. — Ni ore from thre former Hitura mine, Finland Sophie Graul

Close-up of a dark grey sparkly gneiss scattered with small purple-red garnet grains and pale brassy patches of sulphide minerals. — Sulphide-bearing gneiss and quartzite from the Estonian Precambrian basement, Alutaguse zone. Sophie Graul

Close-up of dark blue-grey gneiss scattered with many small brassy yellow and coppery brown metallic mineral grains that glint in the light. — Sulphide-bearing gneiss and quartzite from the Estonian Precambrian basement Sophie Graul

False-colour micrograph of slag: large purple olivine crystals with orange rims, fine yellow branching dendrites, and scattered black angular grains. — Olivine-based slag from a HCFeMn pilot Sophie Graul

Close-up of dark gneiss crossed by wavy silvery metallic veins and fine glittering threads, with small rusty brown grains. — Sulphides mineralisation in Estonian crystalline basement Sophie Graul

Close-up of a cluster of glossy dark brown sphalerite crystals with bright gold crystals branching between them like small trees, against a brown background. — Sphalerite's "Transformer" Dmitry Tonkacheev

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