Botryoidal aragonite and calcite Coprolite This specimen displays the dual-tone

This specimen displays the dual-tone fluorescence especially well

more matte white

they reproduce quickly and are hardy to a range of conditions

5" diameter

Botryoidal aragonite and calcite Coprolite This specimen displays the dual-toneLocale: Sidi Ayed, Fs Mekns Region, Morocco Approx dimensions: 3 x 2. 5 x 2" Approx size: 365g Calcite and aragonite are polymorphs of one another, meaning that the same chemical composition (calcium carbonate) has crystallized into different crystal structures (trigonal and orthorhombic, respectively). Calcite and aragonite often grow together, and the two minerals are also frequent paramorphs of one anothera pseudomorph of the same chemical