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Feldspar

Feldspar

6 items

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

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

Close-up of coarse pink feldspar crystals with flat shiny faces and black patches between them, with the head of a blue geological hammer resting in the lower left. — Detail of K-feldspars pegmatite-like vein on the Kopparnäs coastline, Finland. Sophie Graul

Black-and-white electron micrograph of a weathered mineral surface, smooth and pitted with a rough, crumbly hollow in the middle, with a 20 micrometre scale bar and data panel below. — Accessory Feldspar In Quartz Gunnar Ries

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