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Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 3 (48971921928).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 4 (48972647082).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 2 (48971923768).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 5 (48972645647).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 8 (48971914493).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 6 (48971917458).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 7 (48971915923).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 9 (48971912918).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 10 (48971910748).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 13 (48971906313).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 11 (48972635457).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 12 (48971907593).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 14 (48972457776).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 15 (48972629937).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 17 (48971900543).jpg - Ser Amantio di Nicolao

Columnar-jointed orendite lamproite lava (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 18 (48972452281).jpg - Ser Amantio di Nicolao