Image: Photo micrographs of volcanic rocks

Photo micrographs of volcanic rocks

Photo micrographs of sectioned volcanic rocks to study their minerals and cooling features.

Photographer:
Ian Graham
Rights:
© Ian Graham

Notes

 a) Composite alkali feldspar crystals in fine grained trachyte lava. Polarised light. b) Alkal feldspar overgrowth on chilled trachyte core. Polarised Light. c) Oxidised olivine crystal (red) with flow-aligned alkali feldspar laths in trachyte matrix. Transmitted Light. d) Large plagioclase feldspar crystal rim on resorbed core in basalt matrix with small clusters of augite crystals (brown). Transmitted Light.

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