Mineral Specimen #4464 Cephalopod with Dolomite Crystals
Traverse City Group Limestone, Devonian, Alpena Co., Michigan
9.3 x 3.9 x 2.7 and 7.7 x 4.2 x 2.8 and 5.7 x 3.2 x 3 cm
Ex. Robert Gannon
Three pieces of Cephalopod fossils from one of the large limestone quarries in the Aplena area (check out Google Earth for Alpena and northwards towards Presque Isle and Rogers City, the quarries are clearly visible). Although many fossils can be found in the area, these Cephlapods are seldom encountered. Two of the pieces fit together. Of special interest is the third specimen, the concave end of which is coated with a druze of micro Calcite crystals upon which rest small white Dolomite crystals; this is extremely rare.
Flaws: Minor bruising of the druze Calcite.
This mineral is also found in the following galleries: Minerals From Michigan | Carbonates | Pseudomorphs | Minerals Priced Between 50 and 99 Dollars