This material was made from a fossil giant clam tridacna gigas of middle holocene age. Thus it contains information about water temperaturs of the past. Only available in 5 mm diameter.
OriginMollusc collected from Kume Island in the central Ryukyu Island
Recharacterized after milling
- Major component is Ca with 40 %m/m.
- Mg/Ca-ratio of 1.3 mmol/mol (rounded values).
- Sr/Ca-ratio of 1.7 mmol/mol (rounded values).
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Trace element concentrations in (bio) carbonates are used as proxies in paleo-climate research (foraminifera, corals, pteropods, mussel shells, red algae, stalactites, etc.), serve as proof of origin (corals, otoliths), etc.