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Minerals

Minerals

36 items

Close-up of a white quartz specimen against a black background, with a cluster of translucent, pointed crystals along its top edge. — Quartz Rock Sample from Ain Sokhna, Egypt Ahmed-M- Mohy

Cream and orange gypsum specimen made of many small clustered crystals, lying on a plain white surface and casting a shadow. — Gypsum Mineral Sample Ahmed-M- Mohy

Close-up of a broken black crystal, cracked across into several segments, embedded in a pale grey and white coarse-grained rock. — Broken schorl in a pegmatite Sophie Graul

Close-up of blueschist: a cluster of fine glassy needle-like crystals and silvery flakes against a dark grey-blue background, beneath a pale greenish-yellow granular layer with brown specks. — Details of blueschists Sophie Graul

Close-up of a dark blue-black rock made of shiny, fibrous crystals in criss-crossing sprays, with scattered pale yellowish-green grains of epidote between them. — Glaucophane and epidotes in Blue schists Sophie Graul

Close-up of a polished larvikite surface: large grey feldspar crystals that shimmer pale blue in places, with scattered black angular mineral grains between them. — Feldspars in a larvikite Sophie Graul

Close-up of the polished, broken edge of a larvikite slab: large grey feldspar crystals with a bright blue sheen and fine parallel streaks, dotted with black and dark olive grains. — Feldspars in a larvikite 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 a rounded shell fragment with stripes of rusty orange, dark brown and olive green, surrounded by small glassy grains in a pale cement. — Iron-rich shelly phosphorite, Estonia Sophie Graul

Rough-edged rock sample with a large translucent lilac-grey fluorite crystal crossed by pale green streaks, set in a cream and orange matrix full of small angular fragments. — Octahedral crystal of fluorite in silica matrix. Sophie Graul

Close-up of a cavity in a cream rock lined with small cubic fluorite crystals in yellow, green and lilac, edged by a rim of tiny white sparkling quartz crystals. — Close-up of cubic fluorite crystals Sophie Graul

Close-up of pale green and cream fluorite enclosing clusters of deep purple octahedral crystals with sharp angular outlines and thin white edges. — Zoned fluorite from La Barre former mine, France Sophie Graul

Close-up of a pink garnet crystal criss-crossed by fine white cracks, flanked by dark, blade-like biotite flakes in grey rock. — Estonian Precambrian garnet Sophie Graul

False-colour micrograph of fluid and gas inclusions in quartz: blue bubble-filled shapes on a bright magenta background, one tall form shaped like a small dinosaur. — Baby Dino Bubbles in Quartz Cennet Ulukavak

Thin-section micrograph in polarised light: a cracked turquoise crystal ringed by a radiating rim of multicoloured fibrous crystals, set in large orange and blue grains. — The pretty kind of corona Kristina G Dunkel

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

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

Person in a checked shirt and woven conical hat carrying a battered basin full of reddish rock fragments on their head, in front of a reddish-brown excavated slope. — Gold mining on the Shan Plateau, Myanmar Ian Watkinson

Polarised-light micrograph of agate: concentric rings and round eye-like shapes in banded blue, purple and orange fibres, with dark holes and thin black layers. — Geometric Microscape of Agate Bernardo Cesare

Close-up of a rock packed with blue-green amazonite crystals among pale grey quartz, with rusty stains and a patch of yellow lichen. — Amazonite Formation in the Colorado Rockies Melissa Bukovsky

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

Aerial view looking down on swirled grey and ochre mud dotted with small round sinkholes, and to the right a white salt patch holding pools in turquoise, blue and green. — Colorful sinkholes at the Dead Sea Djamil Al-Halbouni

Polished stone eggs in many colours, turquoise, red, banded orange, green, purple and clear, arranged on a glass shelf around a chrome pole in a museum display case, some with number labels. — Russia geo history Unknown Anton Chupilko

Polished cross-section of fossil wood on a black background: an oval slice with orange-brown rings and pale spokes radiating like a star from a centre of grey and red banded agate. — Star Dadoxylon, Triassic, Mahajunga, Madagascar Peter Huber

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