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Mineral

Mineral

17 items

Polished rock slab of angular fluorite fragments in pale green, lilac and deep purple, cemented by cream and orange chalcedony with a small dark cavity at the right edge. — Hydrothermal fluorite from la Barre former mine, France Sophie Graul

Single fluorite crystal with sharp octahedral faces, translucent blue-green on top and purple at the base, with patches of tan crust in its crevices. — Fluorite octahedron from La Barre mine Sophie Graul

Polished slab with a large cluster of lilac and pale green fluorite crystals and many smaller dark purple fragments, all set in cream and orange chalcedony. — Hydrothermal fluorite from la Barre former mine, France Sophie Graul

Close-up of tiny square torbernite crystals glowing bright green among blurred green and blue mineral grains on a dark background. — Micro torbenite crystals from the Bois-Noirs, France Sophie Graul

Close-up of a large purplish-red garnet crystal crossed by bright white cracks, with dark elongated mineral flakes inside it. — Estonian Precambrian Garnet Sophie Graul

Slender, pale brown snake coiled around a geological hammer with a blue rubber handle, lying on gravelly ground. — A geologist poisonous snake Mohammad Goudarzi

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

Yellow slab of rock with dark, finely branching dendrites spreading across it like fern fronds, lying on a dark blue cutting mat with a white grid. — Labyrinth of mineral leaves Antonio Jordán

Black-and-white electron micrograph of a single calcite crystal shaped like an imperfect cube, each of its three visible faces pitted with a rough, fringed hollow. — Wannabe cubic calcite Joanna Dziadkowiec

Hand holding a reddish-brown rock fragment speckled with tiny glittering mica flakes, with an eroded gully and green fields blurred behind. — Detail of mica specks on the surface of a stone Antonio Jordán

Two round thin-section micrographs of gabbro side by side: on the left, pale and olive-brown mineral grains in plain light; on the right, the same grains glowing orange, red, blue and yellow under crossed polars. — A thin section in gabbro igneous rock, containing most beautiful colorized mineral grains Metwally Hamza

Close-up of a skarn rock with fans of radiating golden-green hedenbergite crystals intergrown with black ilvaite and patches of pinkish mineral, a 20 cent euro coin for scale. — Hedenbergite - Ilvaite skarn, Calamita, Island of Elba Samuele Papeschi

Close-up of a wet, bright orange deposit covered in a network of fine wavy ridges like small terraces, between dark brown and black glistening rock. — Weathering "terraces" Samuele Papeschi

Mineral specimens glowing under ultraviolet light in darkness: fluorite pieces in vivid violet and pink, calcite pieces glowing pale yellow, and a small glowing bottle. — The light shows the real us Eirini Griva

Two footprints pressed into grey mud, each filled with a crust of fine white needle-like salt crystals radiating from the edges. — Salt precipitation after a walk near the Great Salt Lake Jennifer Ziesch

Curving beach of reddish purple sand streaked with yellow, meeting turquoise waves with white surf under a cloudy sky, with a low eroded red bank and a tree on the left. — Garnet sand beach in Sri Lanka Upali de Silva Jayawardena

Water bubbling up in a white frothing boil in the middle of a small rust-brown pool, edged with orange deposits, pale boulders and green grass. — Mineral water spring Tofig Rashidov

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