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This is an amphibolite grade metamorphic rock out of one of the ophiolites in the Klamath Mountains in northern California. It's really a very brilliant green due to the chromium content - I'm not sure the camera or lighting fully captures that.
This porphyritic (olivine phenocrysts) vesicular basalt was collected from a roadcut on the southwest rift zone of Mauna Loa in Hawaii. I believe that it is from the 1907 lava flows in that area, though I'm not certain of that. I'm curious to see how the focus will work on a relatively flat (but not cut) surface. Th...