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Carbonates

Carbonates

5 items

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 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 calcite geode lined with glassy crystal faces, with a small dark round crystal ball in the centre, reddish patches at the edges and a bright blue grain in the lower right. — Microphotograph of a calcite geode found in a glendonite structure 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

Sun rays streaming across rolling hills and fields, with fog banks lying in the valleys between distant mountains and a winding road on the right. — Pyrenees Sunrise, Northern Spain John Counts

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