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Calcium Carbonate

White limestone sample on a blue background with two red boxes linked to enlarged insets showing tiny fossil shells, one rounded with radiating ribs. — Foraminifera Fossils in Limestone from El Kharga Oasis, Egypt Ahmed-M- Mohy

Calcium carbonate concretion occupying the void of an old root Antonio Jordán

Tall rock pillar rising from blue sea next to a cliff of grey and orange-brown rock with green shrubs, with white surf at its base. — Opening the Mesozoic Atlantic ocean Nuno Correia

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

Lumpy, chalky white carbonate concretion about 3.5 cm across on a black background, next to a red centimetre ruler. — Carbonate concretion from a semiarid soil (Calcic Luvisol) near Seville Antonio Jordán

View out of a rocky sea cave onto a white sand beach with scattered boulders and seaweed, turquoise water and a clear blue sky framed by the rough grey cave mouth. — Bermuda Grotto at Low Tide Josue G Millan

Steep, densely wooded green mountainsides around a deep valley, with a bare grey rocky summit behind and a pale rock overhang with a cave-like hollow in the slope on the right. — Karst Landscape (Monte Cucco - Central Apennines) Nicola Morgantini

Hiker with a blue helmet and red jacket walking down a rocky path towards a bowl of grey scree below jagged limestone peaks, with small patches of dirty, debris-covered ice in its hollows. — Calderone glacier (Corno Grande - Gran Sasso - Italy) Nicola Morgantini

Calcic Luvisol (near Sevilla, SW Spain) Antonio Jordán

Close-up of a crumbly reddish-brown clay soil horizon broken into blocky lumps, dotted with white chalky nodules filling cracks and holes. — Calcium carbonate concretions in a soil horizon Antonio Jordán

Hand holding a lump of reddish-brown soil speckled with many white chalky spots and patches of calcium carbonate, against a pale sandy soil wall. — Calcium carbonate concretions in a soil aggregate Antonio Jordán

Open palm holding eight white and cream calcium carbonate nodules, each about the size of a pea or a fingertip, some stained orange-brown with soil. — Large calcium carbonate concretions Antonio Jordán

Calcic Luvisol (Sevilla, SW Spain) Antonio Jordán

Pale cream sandy soil with a white chalky patch and reddish-brown stains at the edges, with a blue plastic lighter lying on it for scale. — Calcareous nodule in a calcic horizon Antonio Jordán

Grey sandstone outcrop with thin, slanting layers broken into ledges and blocks, half buried among pale rippled sand dunes, with small green shrubs on the left. — Sandstone in dune field Andreas Paul

White dripstones of aragonite hanging like thin icicles from a ledge of crumbly ochre sediment, with a black ring placed at lower left for scale. — Evaporite drip stones at the Dead Sea Djamil Al-Halbouni

Slab of pale grey mudstone whose surface is divided by raised ridges into mostly rectangular blocks of different sizes, on a white background. — Mud cracks - nothing's simple David Tanner

Close-up of fingers holding a small round concretion, its broken face orange-brown with patches of black coating, against a blurred blue sky and red ground. — Manganese and iron covering a carbonate concretion Antonio Jordán

Hand holding a flat, rough slab of pale cream calcium carbonate that looks like a rock fragment, against a blurred background of red soil. — Not a rock fragment! Antonio Jordán

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