Aragonite and calcite with botryoidal side Geode UV reactivity Visible calcite fluoresces

UV reactivity Visible calcite fluoresces and phosphoresces faint red under 365 nm UV light

There are some very small calcite crystals sprinkled on the piece

Approx weight: 228g

Daylight fluorescence means the material reacts to the UV in sunlight

Aragonite and calcite with botryoidal side Geode UV reactivity Visible calcite fluorescesLocale: 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