“Calcite, Pupa Gilbert The forming end of the tooth of the purple-spined sea urchin Arbacia punctulata, imaged with a scanning electron microscope and false-colored. One would never guess from their intricate and rounded shape, but these are single-crystals of calcite (CaCO3). They fill space, resist fracture and make the tooth hard enough to grind rock.”

“Calcite, Pupa Gilbert

The forming end of the tooth of the purple-spined sea urchin Arbacia punctulata, imaged with a scanning electron microscope and false-colored. One would never guess from their intricate and rounded shape, but these are single-crystals of calcite (CaCO3). They fill space, resist fracture and make the tooth hard enough to grind rock.”

(Source: news.wisc.edu)

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