COPPER wire on light-green botryoidal clay matrix Beaver Valley Quarry, near Port Ludlow, Jefferson County, Washington, USA Horizontal field of view is ~ 0.3 cm Self-collected in 1998 Photo Copyright © 2016 Jeffrey M. Schwartz
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COPPER wire on light-green botryoidal clay matrix Beaver Valley Quarry, near Port Ludlow, Jefferson County, Washington, USA Horizontal field of view is ~ 0.3 cm Self-collected in 1998 Photo Copyright © 2016 Jeffrey M. Schwartz
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