| 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 |
