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2250 px wide

Thin-section micrograph in vivid colours: large cracked purple, turquoise, yellow and brown crystals set in a mosaic of tiny multicoloured grains, aligned in streaks. — A stunning mylonitic peridotite xenolith from Udachnaya kimberlite Bernardo Cesare

Close-up of a narrow round hole in dark glacier ice surrounded by sandy, gravelly debris, its rippled inner walls leading down to water reflecting a glint of blue sky. — Debris-Stuffed Dark Glacial Ice Madhusudan Thapliyal

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

Eutric Cambisol developed on granodiorite (mountains of Seville, SW Spain) Antonio Jordán

Clusters of yellow, blue and green tents and a white dome spread over a rocky glacier with jagged ice ridges, below a steep, snow-dusted grey mountain face. — Spontaneous Temporary City Ana Maria Machedon

Quarry face of pale beige and orange-brown sand layers, some thin and rippled, some tilted, with a band of finer laminated silt in the middle and small holes near the top. — Sands geometries Silvia Inzoli

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