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 10 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).
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.