James St. John:
Billitonite tektites (indochinites) (Pleistocene, 783-803 ka; Australasian Tektite Strewn Field, Billiton Island, Indonesia)
James St. John:
Rhyodacite pumice (late August 1883 eruption of Krakatoa Volcano, Indonesia; collected at Takwa Beach, coastal Kenya, eastern Africa) 1
James St. John:
Rhyodacite pumice (late August 1883 eruption of Krakatoa Volcano, Indonesia; collected at Takwa Beach, coastal Kenya, eastern Africa) 2
James St. John:
Rhyodacite pumice (late August 1883 eruption of Krakatoa Volcano, Indonesia; collected floating in the ocean)
James St. John:
Porphyritic basaltic andesite (juvenile lava from a 14 June 2006 pyroclastic flow from Mt. Merapi, ~1200 m elevation at Bebeng, Java, Indonesia) 1
James St. John:
Basaltic andesite ash (14 June 2006 pyroclastic flow from Mt. Merapi, ~1200 m elevation at Bebeng, Java, Indonesia)
James St. John:
Echinometra mathaei (fossil echinoid) (Pleistocene; Solo River, Indonesia)
James St. John:
Amethyst & purple chalcedony (Tertiary; Sulawesi, Indonesia) 1
James St. John:
Amethyst & purple chalcedony (Tertiary; Sulawesi, Indonesia) 2
James St. John:
Amethyst & purple chalcedony (Tertiary; Sulawesi, Indonesia) 3
James St. John:
Amethyst & purple chalcedony (Tertiary; Sulawesi, Indonesia) 4
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 1
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 2
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 3
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 4
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 5
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 6
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 7
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 8
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 9
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 10
James St. John:
Amethyst & purple chalcedony (Tertiary; Sulawesi, Indonesia) 5
James St. John:
Amethyst & purple chalcedony (Tertiary; Sulawesi, Indonesia) 6
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 11
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 12
James St. John:
Porphyritic basaltic andesite (juvenile lava from a 14 June 2006 pyroclastic flow from Mt. Merapi, ~1200 m elevation at Bebeng, Java, Indonesia) 2
James St. John:
Porphyritic basaltic andesite (juvenile lava from a 14 June 2006 pyroclastic flow from Mt. Merapi, ~1200 m elevation at Bebeng, Java, Indonesia) 3
James St. John:
Porphyritic basaltic andesite (juvenile lava from a 14 June 2006 pyroclastic flow from Mt. Merapi, ~1200 m elevation at Bebeng, Java, Indonesia) 4
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 13
James St. John:
Sulfidic travertine ("Bumblebee Jasper") (Mount Papandayan, Java, Indonesia) 14
