Aragonite and calcite with botryoidal side Geode Chalcedony is the cryptocrystalline version

Chalcedony is the cryptocrystalline version of quartz with similar requirements for growth

Approx weight: 4 lbs 7 oz

Daylight fluorescence means the material reacts to the UV in sunlight

The morph doesn't seem to be as well isolated as other Zebras

Aragonite and calcite with botryoidal side Geode Chalcedony is the cryptocrystalline versionLocale: Sidi Ayed, Fs Mekns Region, Morocco Approx dimensions: 3 x 2. 75 x 2" Approx size: 480g (1 lb) 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