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Sample Type is Igneous › Volcanic › Felsic Extrusive

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IGSN Sample Type Notes Location Number Thin Sections Storage Location
GRD00HXS0 Trachyte altered porphyritic trachyte (Kspar, Plag phenocrysts) California 0 Ritter 154, 15 H
GRD00I0S0 Rhyolite rhyolite porphyry (euhedral Q-Ks) 0 Ritter 154, 15 G
GRD00IFS0 Obsidian obsidian with pumaceous layer +Q? 0 Camp Elliott
GRD00IJS0 Rhyolite rhyolite cobbles (Q-Ksp) 0 Camp Elliott
GRD00INS0 Obsidian obsidian (half dozen small pieces) 0 Camp Elliott
GRD0170S0 Felsic Extrusive Ash bed dated to approximately 8.6 ma by U.S.G.S. Fission track. California 0
GRD01EVS0 Felsic Extrusive Possible tuffaceous layer in cherty limestone. Italy 0 Camp Elliott
GRD01EWS0 Felsic Extrusive Possible tuffaceous layer. Italy 0 Camp Elliott
GRD01ZCS0 Rhyolite Small cut pebble. Looks and feels like a dense form of pumice. Original label: 10 November, 1980. Pacific Ocean 1 Ritter 154, 37 A
GRD02N3S0 Obsidian Small sample of black perlite with white feldspar phenocrysts California 1 Ritter 154, 15 M
GRD02N6S0 Rhyolite Two pieces of Bishop Tuff. Quartz and brown fiamme in pink groundmass. Original description: Rhyolitic Tuff - Bishop Tuff. Chalky white alteration crust. California 5 Ritter 154, 3 F
GRD02PAS0 Obsidian Red obsidian with scoriaceous pockets. Original label: Melted rock. Obsidian. Monterey Formation. 1988 Fall Field Trip. California 2 Ritter 154, 15 M
GRD02QHS0 Obsidian Obsidian Salton domes(obsidian butte), Salton Sea California 1 Ritter 154, 15 M
GRD02QMS0 Rhyolite Flow banded rhyolite California 0 Ritter 154, 15 L
GRD02R6S0 Obsidian Spherulitic devitrification of obsidian. Large radiating spherulites 0 Ritter 154, 15 M
GRD02ROS0 Rhyolite Aphanitic texture. Mexico 2 Ritter 154, 3 E
GRD02T9S0 Obsidian Obsidian California 0 Ritter 154, 15 M
GRD02W2S0 Latite Quartz Latite California 0 Camp Elliott
GRD02W2S1 Latite Quartz Latite California 0 Camp Elliott
GRD02W3S0 Rhyolite Rhyo-dacite cobble from exposures on sea cliff north of SIO pier. These cobbles form Poway fm cgl, the source was in Sonora Mexico California 0 Ritter 154, 15 G
GRD02WKS0 Felsic Extrusive Gray felsite California 1 Camp Elliott
GRD03Z8S0 Obsidian California 0 Ritter 154, 15 M
GRD0423S0 Felsic Extrusive Welded Tuff Puerto Rico 0 Ritter 154, 29 L
GRD042AS0 Rhyolite Puerto Rico 0 Ritter 154, 29 L
GRD0442S0 Trachyte Fine grained trachyte with abundant fragments of brecciated Belknap syenite. New Hampshire 0 Ritter 154, 29 E