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  3. Petrography

Petrography

13 items
Close-up of a pale rock face packed with large translucent grey and white blade-shaped crystals in fan-like clusters, with a gold-coloured coin for scale.
Outcrop of Calcite/Gypsum Full-growth Crystals Metwally Hamza
Pinkish-beige granite boulder holding dark grey angular blocks of meta-gabbro, lying among rounded grey pebbles, with a red-handled geological hammer for scale.
Example of meta-gabbro/amphibolite enclaves in a granite vein (possible pegmatite texture). Sophie Graul
Thin-section micrograph in polarised light of ocean jasper: a rosette of large quartz crystals in orange, lilac, green and pink, shaped like an embracing couple, within a blue and green fibrous background.
The Embrace (of Ocean Jasper) Bernardo Cesare
Video of a thin-section micrograph showing a coated grain: concentric bands of yellow, green and blue around a teardrop-shaped core of blue and grey crystals. Video, 31 seconds0:31
Karlsbader Sprudelstein Bernardo Cesare
Close-up of a pink granite block speckled with white, pale pink and black mineral grains, lying on brown gravelly soil.
G2-granite hand sample taken from its incubating mountain Metwally Hamza
Pale rock slab covered in dark grey branching manganese dendrites shaped like ferns, with a small coin in the middle for scale.
A specimen shows manganese dendrites Metwally Hamza
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 in polarised light: a blue-grey crystal with a grid of crossing parallel lines and a frayed, feathery rim, set in brownish fine-grained rock.
The Grid: A serpentine pseudomorph after carbonate Kristina G Dunkel
Thin-section micrograph of devitrifying obsidian: a pale blue, cracked crystal nucleus surrounded by brown fan-shaped fibres radiating outwards against a black background, with a thin yellow crystal lath.
Devitrification of Obsidian Joel Gill
Thin-section micrograph in polarised light: round spherulites with radiating fibres in purple, yellow, pink and blue, speckled with black specks, surrounded by mosaic crystals.
micROCKScopica - Ocean Jasper Bernardo Cesare
Thin-section micrograph in polarised light: sharp black blades of graphite crossing large crystals in bright red, golden yellow, orange and blue.
micROCKScopica - Graphite-bearing Granulite Bernardo Cesare
Thin-section micrograph in polarised light: worm-like pale grey plagioclase intergrown with pink and purple-blue pyroxene in an intricate maze pattern.
micROCKScopica - Symplectite in Granulite Bernardo Cesare

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