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Aragonite, 35 crystals per flat Compsognathus35 Specimens of Argonite Per Flat In 2x2 Inch Boxes. Aragonite is a carbonate mineral, one of the two common, naturally occurring polymorphs of calcium carbonate, CaCO3. The other polymorph is the mineral calcite. Aragonite's crystal lattice differs from that of calcite, resulting in a different crystal shape, an orthorhombic system with acicular crystals. Repeated twinning results in pseudo hexagonal forms. Aragonite may be columnar or fibrous,
Constructed from polyresin and standing atop a removable solid wood base
1/4 to 3/4 inches in size
Podolia in Ukraine
is the structure of their teeth
each of which grew out of a separate spinal vertebra (a bone in the back)
Seventy million years ago
The coloration is due to the various minerals that are present during fossilization
giant protozoans
recommended conservative usage of the genus
It may have eaten sharks
Living members of this family are often called guitarfishes
which tells us about the osteology of these ancient animals