James St. John:
Moldavite (Miocene, 14.5-14.8 Ma; Ries Impact Crater's tektite strewn field, Bohemia) 1
James St. John:
Hyalite opal on vesicular porphyritic leucite tephrite (Doupov Volcanic Complex, Oligocene to Lower Miocene; hills of the Doupov Mountains, north or west of Valec (Waltsch), northwestern Bohemia) 1
James St. John:
Hyalite opal on vesicular porphyritic leucite tephrite (Doupov Volcanic Complex, Oligocene to Lower Miocene; hills of the Doupov Mountains, north or west of Valec (Waltsch), northwestern Bohemia) 2
James St. John:
Hyalite opal on vesicular porphyritic leucite tephrite (Doupov Volcanic Complex, Oligocene to Lower Miocene; hills of the Doupov Mountains, north or west of Valec (Waltsch), northwestern Bohemia) 3
James St. John:
Ellipsocephalus hoffii (fossil trilobites) (Jince Formation, Middle Cambrian; vicinity of Jince, Stredocesky Region, Bohemia, Czech Republic) 1
James St. John:
Ellipsocephalus hoffii (fossil trilobites) (Jince Formation, Middle Cambrian; vicinity of Jince, Stredocesky Region, Bohemia, Czech Republic) 2
James St. John:
Ellipsocephalus hoffii (fossil trilobites) (Jince Formation, Middle Cambrian; vicinity of Jince, Stredocesky Region, Bohemia, Czech Republic) 3
James St. John:
Ellipsocephalus hoffii (fossil trilobite) (Jince Formation, Middle Cambrian; vicinity of Jince, Stredocesky Region, Bohemia, Czech Republic) 4
James St. John:
Paradoxides minor fossil trilobite (Jince Formation, Middle Cambrian; Jince area, Bohemia, Czech Republic) 1
James St. John:
Paradoxides minor fossil trilobite (Jince Formation, Middle Cambrian; Jince area, Bohemia, Czech Republic) 2
James St. John:
Paradoxides minor fossil trilobite (Jince Formation, Middle Cambrian; Jince area, Bohemia, Czech Republic) 3
James St. John:
Paradoxides minor fossil trilobite (Jince Formation, Middle Cambrian; Jince area, Bohemia, Czech Republic) 4
James St. John:
Silver (Czech Republic) 1
James St. John:
Silver (Czech Republic) 2
James St. John:
Silver (Czech Republic) 3
James St. John:
Hyalite opal (Waltsch, Bohemia)
James St. John:
Metazeunerite (Cinovec, Bohemia, Czech Republic)
James St. John:
Hyalite opal (Bohemia, Czech Republic) 1
James St. John:
Hyalite opal (Bohemia, Czech Republic) 2
James St. John:
Hyalite opal fluorescing (Bohemia, Czech Republic) 3
James St. John:
Hyalite opal fluorescing (Bohemia, Czech Republic) 4
James St. John:
Star quartz (Czech Republic) 1
James St. John:
Star quartz (Czech Republic) 2
James St. John:
Hyalite opal fluorescing (Bohemia, Czech Republic) 5
James St. John:
Moldavite (Miocene, 14.5-14.8 Ma; Ries Impact Crater's tektite strewn field, Bohemia) 2
James St. John:
Moldavite (Miocene, 14.5-14.8 Ma; Ries Impact Crater's tektite strewn field, Bohemia) 3
James St. John:
Native silver-bearing hydrothermal vein (mine near Joachimsthal, Bohemia) 1
James St. John:
Pyrite-bearing hydrothermal vein (mine near Joachimsthal, Bohemia)
James St. John:
Native silver-bearing hydrothermal vein (mine near Joachimsthal, Bohemia) 2
James St. John:
Native silver-bearing hydrothermal vein (mine near Joachimsthal, Bohemia) 3
