By Romel Villanueva Lujan | 2019-08-06
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On 08/20/2019 04:00 pm by Dr Ski | Dumaguete, Philippines
Fossilized invertebrae exoskeletons (coral). These are made from calcium carbonate, the same material found in limestone, pearls and eggshells.
Canon EOS M10
45mm, f6. 3 + 26mm macro extension
1/80s, ISO200
