Diabase sill in marble, California
igneous, intrusive
Pegmatite dike in granitic rock.
granite, igneous, intrusive, minerals
Composite dike
igneous, intrusive
Pegmatite intruding gneiss , California
sill, dike, igneous intrusion, intrusive
Intrusive contact: southern Sierra Nevada.
igneous, intrusive
Ash Flow tuff, Crater Lake, (vertical)
differential erosion, volcanic, pyroclastic, weathering, RGO, Cascade volcanoes
Aplite dikes in granite, Utah (vertical)
intrusive, igneous, granitic
Pyroclastic rock, Oregon Cascades
Cascade volcanoes
Vitrophyre in welded tuff, SE California
pyroclastic, volcanic
horizontally oriented dike, Oregon
mafic intrusion, igneous
Colonnade in basalt, Oregon
CRBG, columns, columnar, colonnade
Rapakivi granite close-up
granitic
Magmatic flow foliation in granitic rock
granite, intrusive, igneous, minerals
Pumice Deposit
RGO, pyroclastic
Cretaceous granodiorite: Mt. Whitney, CA
granite, granitic, cliffs, alpine
Granite and Moon.
felsic
Volcanic Rock Samples
Collected samples of volcanic rock named from left to right: rhyolite, andesite, basalt. (Image ID# ig-851)
Volcanic Rock Samples
hand specimens
Intrusive Igneous Rocks
hand samples, specimens