Concretions

Object of the Month: 06/2009

What is it?:

Naturally formed stone concretions.


Where was it collected:

Lake Superior, Wabasha, Minnesota, and Cook Inlet, Alaska


Concretions: Concretions can come in all sorts of shapes, colors, and sizes. What do they look like to you?
Concretions: Concretions can come in all sorts of shapes, colors, and sizes. What do they look like to you?Courtesy SMM

Beneath the earth, a stone grows from a seed.

A shard of crystal or the shed tooth of an extinct beast becomes the heart of a new stone. Wandering molecules of minerals in slow underground precipitation find their home on the surface of this kernel, blanketing it like layers of heavy, wet snow.

Growing in the dark for years, the stone is shaped by the spaces in the sediment around it, sculpted for generations by the earth and rocks. But it’s not until you came, and lifted it from the beach, or pulled it from a cliff, or saw it at the Science Museum that the sculpture could have a name. The forces of the Earth have made this rock within a rock, this concretion, but what do you see?