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Close-up of a polished cross-section through a brachiopod shell: wavy fine white and grey layers with black bands, surrounded by glassy sand grains and other shell fragments. — Cross-section of a brachiopod from the shelly phosphorite of Estonia, former Ülgase mine Sophie Graul

Close-up of a large grey brachiopod shell fragment with fine dark parallel lines, among smaller banded shell pieces and glassy grains in a white crystalline matrix. — Shelly phosphorite from the Aseri deposit, Estonia. 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 polished rock surface with a curved cream and orange shell fragment, dark pores and rounded grains set in a mottled yellow, orange and white carbonate cement. — Iron-rich shelly phosphorite, Estonia Sophie Graul

Close-up of a long shell fragment striped in reddish brown, cream and dark lines, set among clear rounded quartz grains and pale yellow and olive banded material in a white cement. — Iron-rich shell fragment cemented by carbonate from the Kabala phosphorite deposit, Estonia Sophie Graul

Close-up of many thin, elongated shell fragments in grey, black and cream, lying roughly parallel in a sparkling white crystalline cement. — Carbonate-cemented shells in Estonian phosphorites, from the Toolse deposit Sophie Graul

Close-up of shiny grey and dark blue brachiopod shells with fine growth lines, embedded in pale sandy rock among small black fragments. — Estonian shelly phosphorites Sophie Graul

Close-up of dark gneiss crossed by wavy silvery metallic veins and fine glittering threads, with small rusty brown grains. — Sulphides mineralisation in Estonian crystalline basement Sophie Graul

Close-up of a glossy brown brachiopod shell with fine concentric growth lines and rainbow iridescence, embedded in sandy rock with dark shiny fragments. — Iridescent shelly phosphorite from Estonia Sophie Graul

Huge terraced marble quarry with stepped walls of cut cream blocks, dirt roads winding down to the pit floor and small machines, under a cloudy sky with distant mountains. — Marble quarry west of Alicante, Spain Christoph Mayr

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