xenoliths

Peridotite mantle xenolith in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 38
by James St. John

Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 37
by James St. John

Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 33
by James St. John

Peridotite mantle xenolith in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 34
by James St. John

Peridotite mantle xenolith in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 35
by James St. John

Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 36
by James St. John

Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 32
by James St. John

Peridotite mantle xenoliths in phonotephrite (Peridot Mesa Flow, Middle Pleistocene, 580 ka; Peridot Mesa, San Carlos Volcanic Field, Arizona, USA) 31
by James St. John

Ison Creek Kimberlite (Elliott County Peridotite, Late Cretaceous, 75 Ma; west of Stephens, Elliott County, Kentucky, USA) 23
by James St. John

Ison Creek Kimberlite (Elliott County Peridotite, Late Cretaceous, 75 Ma; west of Stephens, Elliott County, Kentucky, USA) 24
by James St. John

Ison Creek Kimberlite (Elliott County Peridotite, Late Cretaceous, 75 Ma; west of Stephens, Elliott County, Kentucky, USA) 22
by James St. John

Xenolith 1
by James St. John

Xenolith in granite (Acadia National Park, Maine, USA) 4
by James St. John

Xenolith in granite (Acadia National Park, Maine, USA) 5
by James St. John

Xenolith in granite (Acadia National Park, Maine, USA) 6
by James St. John

Xenolith in granite (Acadia National Park, Maine, USA) 3
by James St. John

Xenolith (Sierra Nevada Batholith, Cretaceous; near Dana Fork, Yosemite National Park, California, USA)
by James St. John

Xenolith (Half Dome Granodiorite, Late Cretaceous, 89-93 Ma; outcrop next to Tenaya Lake, Yosemite National Park, California, USA) 2
by James St. John

Xenolith (Half Dome Granodiorite, Late Cretaceous, 89-93 Ma; outcrop next to Tenaya Lake, Yosemite National Park, California, USA) 1
by James St. John

Xenoliths in granite (Acadia National Park, Maine, USA) 2
by James St. John

Xenoliths in granite (Acadia National Park, Maine, USA) 1
by James St. John

Gneiss xenolith in anorthosite (Marcy Anorthosite, Mesoproterozoic, 1.16 Ga; Route 18 roadcut west of Saranac Lake, New York State, USA) 2
by James St. John

Gneiss xenolith in anorthosite (Marcy Anorthosite, Mesoproterozoic, 1.16 Ga; Route 18 roadcut west of Saranac Lake, New York State, USA) 3
by James St. John

Gneiss xenolith in anorthosite (Marcy Anorthosite, Mesoproterozoic, 1.16 Ga; Route 18 roadcut west of Saranac Lake, New York State, USA) 4
by James St. John

Xenolith in alkaline olivine basalt (Bonito Lava Flow, upper Holocene, erupted from Sunset Crater; San Francisco Volcanic Field, Arizona, USA)
by James St. John

Orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 12
by James St. John

Orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 13
by James St. John

Pumiceous orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 1
by James St. John

Orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 11
by James St. John

Orendite lamproite with xenoliths (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 7
by James St. John

Orendite lamproite with xenoliths (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 8
by James St. John

Orendite lamproite with xenoliths (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 9
by James St. John

Orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 10
by James St. John

Orendite lamproite with xenoliths (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 6
by James St. John

Orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 2
by James St. John

Orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 3
by James St. John

Orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 4
by James St. John

Orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 5
by James St. John

Orendite lamproite with xenolith (Pleistocene, 1.30-1.37 Ma; Black Rock volcanic center, Leucite Hills, Wyoming, USA) 1
by James St. John

Wyomingite with xenolith (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 8
by James St. John

Wyomingite with xenolith (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 6
by James St. John

Wyomingite with xenolith (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 7
by James St. John

Wyomingite with xenolith (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 3
by James St. John

Wyomingite with xenolith (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 4
by James St. John

Wyomingite with xenolith (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 5
by James St. John

Wyomingite with xenolith (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 1
by James St. John

Wyomingite with xenolith with xenolith (Pleistocene, 950-960 ka; Zirkel Mesa, Leucite Hills, Wyoming, USA) 2
by James St. John

Wyomingitic volcanic breccia with xenoliths (Lower Pleistocene, 2.19-2.56 Ma; Boar's Tusk, Leucite Hills, Wyoming, USA) 2
by James St. John

Wyomingitic volcanic breccia with xenoliths (Lower Pleistocene, 2.19-2.56 Ma; Boar's Tusk, Leucite Hills, Wyoming, USA) 4
by James St. John

Wyomingitic volcanic breccia with xenoliths (Lower Pleistocene, 2.19-2.56 Ma; Boar's Tusk, Leucite Hills, Wyoming, USA) 3
by James St. John

Wyomingitic volcanic breccia with xenoliths (Lower Pleistocene, 2.19-2.56 Ma; Boar's Tusk, Leucite Hills, Wyoming, USA) 1
by James St. John

Sedimentary xenolith in madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 2
by James St. John

Sedimentary xenolith in madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 3
by James St. John

Sedimentary xenolith in madupite lamproite (Late Pliocene, 3 Ma; Pilot Butte volcanic center, Leucite Hills, Wyoming, USA) 1
by James St. John

Xenolith in andesite (Tertiary; Yellowstone, Wyoming, USA) 13
by James St. John

Xenolith in andesite (Tertiary; Yellowstone, Wyoming, USA) 14
by James St. John

Xenolith in andesite (Tertiary; Yellowstone, Wyoming, USA) 15
by James St. John

Xenolith in andesite (Tertiary; Yellowstone, Wyoming, USA) 16
by James St. John

Xenolith in andesite (Tertiary; Yellowstone, Wyoming, USA) 11
by James St. John

Xenolith in andesite (Tertiary; Yellowstone, Wyoming, USA) 7
by James St. John