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Geochemistry

Geochemistry

14 items

Close-up of a translucent, honey-yellow crystal with ridged, rough faces and yellow staining, held between the fingertips against a dark background. — Gypsum Crystal from the Qattamiya Area, Cairo – An Evaporitic Mineral Growth Ahmed-M- Mohy

Smiling child holding up both hands stained bright orange-red with clay, with smears of it on one cheek, in front of a blurred green and red-earth background. — A mini-experiment by a mini-scientist Antonio Jordán

Close-up of crumbly brown rock in a dim cavity, with thin white needle-like calcite crystals and a small clear crystal sticking out of its surface. — Needles-like Calcite Crystals within Limegrits in a region of Pb/Zn Ores Occurrence Metwally Hamza

Close-up of a crumbly crystalline rock surface: sugary pale peach and orange crystals on the left and grey crystal crusts on the right. — Growth of Calcite (CaCO3) & Gypsum (CaSO4.2H2O) on Lead/Zinc Ore Deposits Metwally Hamza

Pale green rock specimen packed with long, dark, needle-like crystals in random orientations, on a black background with a 1 cm scale bar. — Blue schist sample from the Isle of Groix with ferroglaucophane Sophie Graul

Close-up of shelly phosphorite: elongated grey brachiopod shell fragments with fine wavy bands, set in a white crystalline cement, with clusters of dark grains on the right. — Shelly phosphorites from the Aseri deposit. Sophie Graul

Thin-section micrograph of shelly phosphorite: long dark olive and brown shell fragments in parallel streaks, surrounded by small rounded quartz grains in pale blue, grey and pink. — Thin section in PPL of shelly phosphorite from the Ülgase deposit, Estonia. Sophie Graul

Close-up of a large grey brachiopod shell fragment with fine dark parallel lines, among smaller banded shell pieces and glassy grains in a white crystalline matrix. — Shelly phosphorite from the Aseri deposit, Estonia. Sophie Graul

Close-up of an elongated dark blue-grey shell fragment with fine glittering dark bands, surrounded by clear glassy quartz grains and a pale cement. — Pyritised brachiopod shell fragment from the Toolse phosphorite deposit, Estonia. Sophie Graul

Close-up of a pointed dark shell fragment with blue-grey streaks and a fine sparkling metallic sheen, lying among rounded clear quartz grains. — Pyritised brachiopod shell fragment from the Toolse phosphorite deposit, Estonia. Sophie Graul

Close-up of shelly phosphorite: upright brachiopod shell fragments with grey, white and brown stripes, set in white crystalline carbonate cement against a blurred grey background. — Carbonate-cemented shelly phosphorite Sophie Graul

Person in a hooded jacket pointing a stick at a large dark rock streaked with bands of orange, red and green, in a rubble-strewn pit with rusty orange stained walls. — Typical Supergene Zone of a Cu Deposit Mohammad Goudarzi

Close-up micrograph of tiny fluid inclusions in clear calcite: dozens of small rounded and angular bubbles with violet outlines scattered in a curving trail across a pale grey crystal. — Minerals´tiny secrets Petronela Ševčíková

Tall spiny cacti on a rocky brown island edge overlooking a dazzling white salt flat with wavy ridges near its shore. — Salty Waves at Spiky Shores Andreas Brotzer

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