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Thin Section

Thin Section

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Thin-section micrograph of fossil bone: turquoise bone tissue with black dots, shaped like a snake head with an eye, surrounded by pores filled with radiating multicoloured crystals. — The Snake in the Dinosaur Bone Bernardo Cesare

Thin-section micrograph of pumice: a mass of small rounded bubbles, many outlined in black, in pale glass with brown streaks and a few green crystals. — A thin section in pumice extrusive/volcanic igneous rock Metwally Hamza

Thin-section micrograph in vivid interference colours: interlocking grains in pink, blue, orange and green, and grey grains with fine parallel stripes. — A thin section contains a wide variety of mineral grains Metwally Hamza

Thin-section micrograph of a large cracked yellow crystal with straight sides set in a dark speckled fine-grained mass, with a few smaller grey crystals. — An euhedral crystal (the biggest one in the photo) in groundmass matter Metwally Hamza

Thin-section micrograph of a large plagioclase grain with parallel blue, grey and black stripes running diagonally, next to a cracked orange grain. — A thin section shows a coarse plagioclase mineral grain Metwally Hamza

Two round thin-section micrographs of gabbro side by side: on the left, pale and olive-brown mineral grains in plain light; on the right, the same grains glowing orange, red, blue and yellow under crossed polars. — A thin section in gabbro igneous rock, containing most beautiful colorized mineral grains Metwally Hamza

Thin-section micrograph of a dark rock with a long blue elongated glaucophane grain in the middle, surrounded by fine green and yellowish crystals and large dark brown rounded grains. — Glaucophane grains in retrogressed metabasalt Samuele Papeschi

Thin-section micrograph in crossed polars of a mylonite: diagonal bands of small black, grey and white quartz grains separated by thin streaks of golden-brown fine mica. — Quartz - sericite mylonite, Calamita, Elba Samuele Papeschi

Stained thin-section micrograph: two dark rounded fossil fragments with honeycomb-like cells, set in a mosaic of bright blue and turquoise crystal grains. — Blue cements in Jurassic rocks? Remi Charton

Thin-section micrograph of granite in crossed polarised light: a mosaic of mineral grains in vivid purple, orange, yellow, blue and green interference colours, with a few dark elongated crystals. — Epidote Gunnar Ries

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