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 LIGHTNING RIDGE SOLID BLACK OPAL GEM 18k Y GOLD RING  US $864.64
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Abnormal beach finding, rock?
http://photos-f.ak.fbcdn.net/hphotos-ak-snc3/hs027.snc3/11434_1283613447256_1137695447_30894578_3259536_n.jpg
Any idea of what this is?
Smell: Burnt, saltwater...maybe dead-ish?
Feel: Smooth, ridges, hard crusty between smooth ridges. Heavy...maybe 10lbs? Rock solid.
Look: Shiny, black with white quarts like deposits between ridges.
Im not so sure it is a shell. Maybe a rib cage of a marine animal. The Quartz like deposits could be the mineral calcite or even salt (halite) deposits.
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