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One order is approximately five square inches for the septarian nodule slabs from UT. These will take an interesting polish due to the contrast and materials of different hardness. (The outer layer is limestone, with a brecciated brown aragonite and center of yellow calcite.) Some slabs of septarian nodules can be quite large, (6-8" round) 5 square inches will be a portion of a slab. E-mail for any questions or requests for complete slabs. We have polished some complete slabs in the past on a flat lap and used them for clock faces and they turned out quite nice! See Assorted Lapidary Tips for polishing slabs. Stock 645s.
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