O-Subject Index                      
Cochise College                                                                                        
Geology Home Page 
Subject Index-Main Page
Roger Weller, geology instructor 
wellerr@cochise.edu )
last edited:  3/23/17     


obsidian, Apache tears
obsidian   gemstone photos
obsidian eruption, Mono Lake area, California   photo tour
obsidian, general #1
obsidian, general #2
ocean jasper   gemstone photos
Ohio geology   Internet links
oil shale
oil wells-Oklahoma   Google Earth geology project
oil wells-Wyoming   Google Earth geology project

Okefenokee Swamp, Georgia   geology maps
okenite   mineral photos
Oklahoma geology   Internet links
Oklahoma-earthquakes and oil wells   Google Earth geology project
oligoclase   mineral photos
olivenite   mineral photos
olivine   mineral photos
olivine and peridot #1
olivine and peridot #2
Olympus Mons, Mars
onyx   gemstone photos
oolite   rock photos

opal    gemstone photos
opal   mineral photos
opal, jelly-transparent   gemstone photos
opals, gemstones
opals, history
opals, proper care

opals, queen of gemstones   gemstone and specimen photos
ophiolite   rock photos
orbicular granite   specimen photo
ore deposits and mines-Ural Mountains, Russia   Google Earth geology project
ore deposits and mines-western USA   Google Earth geology project
oreodont fossil   fossil photograph
Oregon coastline   photo tour
Oregon, Crater Lake   photo tour
Oregon geology   Internet links
Oregon- Volcanoes of the Cascade Mountains    Google Earth geology project
Oregon- Volcanoes plus mapping techniques   Google Earth geology project
orpiment   mineral photos
orpiment in quartz   gemstone photos
orthoclase   mineral photos
Orthorhombic Crystal System   models and mineral examples
oxbow lakes   Google geology project
Ozark Dome   geology maps

Copyright 2016 R.Weller