Another image is available for Tuesday, April 9th, 2013
Galena and Quartz Crystals
This specimen is from Colorado. Galena is a natural lead sulphide, the most important form of lead ore. Crystals are generally cubic as seen here, or octahedral. Quartz is the second most abundant mineral in the Earth's crust, often forming spike-like trigonal crystals as above. From my personal collection. EOS 6D, EF 50 mm ƒ/1.4, ES 71II: 2.5 sec, ƒ/22, ISO 100, six 20w Xenon bulbs (check out the shadows!), tripod.
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