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Calcium Carbonate

Rough stone with red box highlights textured details against a blue background. — Foraminifera Fossils in Limestone from El Kharga Oasis, Egypt Ahmed-M- Mohy

Keys and a red tool lie on cracked, dry earth with visible layers. — Calcium carbonate concretion occupying the void of an old root Antonio Jordán

A tall rock formation stands isolated in the sea, surrounded by rugged cliffs and blue waters. — Opening the Mesozoic Atlantic ocean Nuno Correia

Hexagonal structure with intricate, organic patterns etched on its surface. — Wannabe cubic calcite Joanna Dziadkowiec

Rough white rock fragment displayed against black background with red ruler for scale. — Carbonate concretion from a semiarid soil (Calcic Luvisol) near Seville Antonio Jordán

Cave opening frames a serene beach with turquoise water under a clear blue sky. — Bermuda Grotto at Low Tide Josue G Millan

Lush green mountains under a blue sky with a prominent cave entrance visible. — Karst Landscape (Monte Cucco - Central Apennines) Nicola Morgantini

Hiker in red jacket climbs rocky mountain terrain under clear sky. — Calderone glacier (Corno Grande - Gran Sasso - Italy) Nicola Morgantini

Calcic Luvisol (near Sevilla, SW Spain) Antonio Jordán

Cracked, textured mud with white patches forms rugged, layered formations. — Calcium carbonate concretions in a soil horizon Antonio Jordán

A hand holds a brown rock with white patches against a sandy background. — Calcium carbonate concretions in a soil aggregate Antonio Jordán

Hand holding small white and brown pebbles against a sandy background. — Large calcium carbonate concretions Antonio Jordán

Calcic Luvisol (Sevilla, SW Spain) Antonio Jordán

Blue lighter rests on textured, weathered concrete surface. — Calcareous nodule in a calcic horizon Antonio Jordán

Desert dunes stretch into the distance with sparse vegetation and rugged rock formations. — Sandstone in dune field Andreas Paul

A textured cliff face with white, stalactite-like formations hanging from its edge. — Evaporite drip stones at the Dead Sea Djamil Al-Halbouni

Rough, light gray rock with visible layers and a jagged top. — Mud cracks - nothing's simple David Tanner

Person holding a weathered, rust-colored object against a desert landscape. — Manganese and iron covering a carbonate concretion Antonio Jordán

Hand holding a weathered, sandy-colored rock against a reddish-brown dirt background. — Not a rock fragment! Antonio Jordán

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