Aragonite and calcite with botryoidal side Geode Daylight fluorescence means the material

Daylight fluorescence means the material reacts to the UV in sunlight

There are some very small calcite crystals sprinkled on the piece

Portions that fluoresce red also have very brief phosphorescence

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

Aragonite and calcite with botryoidal side Geode Daylight fluorescence means the materialLocale: 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