PreviousNext RUC2897 - CALCITE in Mercenaria Permagna $200.00 Locality Rucks' Pit, near Fort Drum, Okeechobee County, Florida, USA Dimensions 74mm x 58mm x 31mm Nice Mercenaria with gemmy yellow calcite crystals to over 1 cm growing downward from the full bridge. Calcite is absent from most of the interior bottom of the specimen.