Another one from near Marshall's beach, this boulder is composed of serpentinite, a rare rock type that is most often developed in subduction zones, where one tectonic plate is subducted under another.
This boulder appears to contain an asbestos vein network. In addition to asbestos, serpentinite can contain high levels of magnesium, chromium, and nickel. My advice- don't lick it.
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Taken near Marshall's beach, California, USA, not far from the city side of the Golden Gate Bridge. Beach Boulder by Pete Ha... -
I had read somewhere that 50mm lenses are ideal for photogrammetry, so I had been shying away from using my 18mm lens. This tree was particu...
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