This is a paleontological question. The object that fills most of the image is an ooid, a concentrically laminated carbonate particle. This one is 1.4 mm in the long dimension. The inner part of the ooid is a fossil, which consists of hollow calcite objects of variable shape. The calcite consists of crystals normal to the surface of each particular object. Given the shapes visible in this cross-section through the object, they must be roughly equant. The question is, what organism made this fossil?
The rock is Mississippian in age.
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