Day Fluorescent Fluorite - Small Prehnite The unique blue coloration is

The unique blue coloration is caused by a copper substitution for calcium with white patterns or streaks

but a group of minerals with similar crystal structures

Its delicate pink color is due to microscopic inclusions of aligned silicate mineral fibers

and polishes to a nice luster

These pieces are polished into an angel shape

Day Fluorescent Fluorite - Small Prehnite The unique blue coloration isNatural 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 one piece selected from our current stock. All pieces are of similar size and quality. Average Dimensions: 1 L X 0. 5 W X 0. 37 H inches Average weight: 0. 03 lbs