An ooid, a concentrically laminated calcium carbonate spheroid, formed inorganically by wave action around a pre-existing nucleus. The nucleus in this case is the microscopic shell of an amoeba called a foraminiferan. Just so you know.
A tiny box without key or lid
inside a chambered treasure hid
its maker dead and long forgot
yet carbon saved so we aren't hot
Doggerel again, I'm afraid.
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