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Malachite and Azurite
Malachite (green) and Azurite (blue). both copper carbonate minerals. (110608-33)
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Cleavage and bedding in sedimentary rock (Vertical)
Cleavage and bedding in pebble conglomerate and sandstone, Oregon. (110531-7)
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fluvial cross-bedding in sandstone.
Small-scale cross-bedding in sandstone. Photo is about 75 cm across. (110528-61)
Download ImagePaleosols of John Day Formation, OR
Eroded ash beds and ancient soils (paleosols) of the Oligocene John Day Formation, Oregon. John Day Fossil Beds National Monument. (110531-73)
Download ImageWhite asbestos: chrysotile. (vertical)
White asbestos, (chrysotile, a magnesium silicate).
Download ImageAngle of repose (vertical)
Angle of repose: gravel and sand being deposited atop a cone of aggregate from a conveyor belt. (110531-91)
Download ImageAngle of repose
Angle of repose: gravel and sand being deposited atop a cone of aggregate from a conveyor belt. (110531-90)
Download ImageRapakivi granite close-up
Rapakivi granite: a granite with feldspars of orthoclase cores and oligoclase (plagioclase) rims. Note the zoning in the feldsars. Penny for scale. (110530-25)
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Rapakivi granite close-up
Rapakivi granite: a granite with feldspars of orthoclase cores and oligoclase (plagioclase) rims. Note the zoning in the feldsars. (110530-24)
Download ImagePaleosol (ancient soil) between two basaltic lava flows, eastern
Paleosol (ancient soil) between two basaltic lava flows, eastern Oregon.
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Rapakivi granite close-up
Rapakivi granite: a granite with feldspars of orthoclase cores and oligoclase (plagioclase) rims. Note the zoning in the feldsars. Penny for scale. (110530-23)
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