Day Fluorescent Fluorite Large - B cut base formed when volcanic lava rich

formed when volcanic lava rich in silica cools rapidly and forms without the formation of crystals

about 350 million years ago

or other oxides creating a spotted appearance

This piece has been heat-treated to form a crystal

Copper is an elemental mineral that crystallizes in the isometric crystal system

Day Fluorescent Fluorite Large - B cut base formed when volcanic lava richNatural Fluorite from England. This piece is "day fluorescent" green inside and develops into a dark blue when in the sunlight. Also fluorescent with a 365nm UV Flashlight. You will receive the exact item pictured Dimensions: 3. 5 L X 3 W X 2. 12 H inches Weight: 0. 26 lbs