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  • Spatial Coverage is exactly "Quarry face at back of parking lot of Castle Lanes Bowling Center on Geneva Ave. (near the Cow palace) on the north side of San Bruno Mountain. "

DSC_1847.jpg
Coarse sand grains made of quartz, surrounded by smaller feldspar grains. Greenish blue surface color, minimal surface weathering.

(Thin section FOV: 1.28)
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