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Igneous

8 items
Rock with rectangular cutout and visible debris.
Half muscovite, half biotite Sophie Graul
Close-up of a broken black crystal, cracked across into several segments, embedded in a pale grey and white coarse-grained rock.
Broken schorl in a pegmatite Sophie Graul
Close-up of a rock with stacked thin shiny sheets of silvery and brown mica alternating with dark and pale grey grainy bands.
Layers of muscovite in a pegmatite vein Sophie Graul
Close-up of a polished larvikite surface: large grey feldspar crystals that shimmer pale blue in places, with scattered black angular mineral grains between them.
Feldspars in a larvikite Sophie Graul
Close-up of the polished, broken edge of a larvikite slab: large grey feldspar crystals with a bright blue sheen and fine parallel streaks, dotted with black and dark olive grains.
Feldspars in a larvikite Sophie Graul
Polished rapakivi granite with large round pale pink orthoclase crystals, each ringed by a greenish-grey rim, among smaller pink, green and black grains.
Rapakivi granite with typical round orthoclase crystals with oligoclase rims, Finland Sophie Graul
Tall rock pinnacle topped by a rounded boulder, rising beside other reddish rock outcrops above green pines and shrubs under a deep blue sky.
Paradise with a history of violence Dan Killam
Shiny black chunks of obsidian with glassy curved surfaces on a rocky slope, with an orange and yellow mountain under a deep blue sky.
Obsidian rocks, Landmannalaugar, Iceland Ragnar Sigurdsson (arctic-images.com)

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