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Phosphorite

Phosphorite

13 items

Close-up of a polished cross-section of shelly phosphorite: long banded white, grey and black shell fragments packed among small glassy rounded quartz grains, with a few rusty orange patches. — Cross section of shelly phosphorite from Ülgase, Estonia Sophie Graul

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

Micro textures of Estonian shelly phsophorites Sophie Graul

Thin-section micrograph of shelly phosphorite: long dark olive and brown shell fragments in parallel streaks, surrounded by small rounded quartz grains in pale blue, grey and pink. — Thin section in PPL of shelly phosphorite from the Ülgase deposit, Estonia. Sophie Graul

Thin-section micrograph of shelly phosphorite: many brown, finely striped shell fragments, long and curved or short and blocky, packed between clusters of clear crackled quartz grains. — Thin section in PPL of shelly phosphorite from the Ülgase deposit, Estonia. Sophie Graul

Close-up of shelly phosphorite: upright brachiopod shell fragments with grey, white and brown stripes, set in white crystalline carbonate cement against a blurred grey background. — Carbonate-cemented shelly phosphorite Sophie Graul

Close-up of a drill core of dark grey, speckled sandstone lying in a wooden core box, its rough surface dotted with small pale and dark grains and shiny shell fragments. — Shelly phosphorite drill core Sophie Graul

Reflected-light micrograph of a long, layered brachiopod shell fragment, grey with bright gold and rusty orange patches, lying above a dark mass of smaller grey rounded and elongated grains. — Pyritised brachiopod shell from Aseri phosphorite deposit Sophie Graul

Close-up of a long, dark grey shell fragment with fine pale stripes and thin glittering lines, beside a clear rounded quartz grain and surrounded by smaller glassy grains. — Pyritised 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 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

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

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