Fluorescent 'Dragon Egg' Fluorite Slice - Inner Mongolia
Contributed by: FMS Admin
Date: Feb 24th, 2026
Locality: Inner Mongolia, China (See on Mindat)
Size: 3.5 x 1.5 x 4.5 inches
Weight: 4.25 lb
Description:
These fluorite slices originated in the Inner Mongolia region of China. The fluorite nodule formed around a mineral inclusion[s] and, over time, additional layers of fluorite formed. The further from the inclusion [brown color], the lighter the green shade of the fluorite. The nodule was then cut and polished to create this end slice. The fluorite is somewhat transparent, and lower layers can be seen from the cut and polished surface. While shortwave ultraviolet light exposure does not create the brightest fluorite fluorescence, it does permit the inclusion to fluoresce better than the other wavelengths.
Fluorescent pictures were taken at ISO-100, f/11 for 2.5 seconds.
Originally posted by John Rofrano on Nature's Rainbows.
Summary of luminescence responses:
Calcite (Mindat) (RRUFF)
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
- Fluorescence under Longwave (365nm LED) UV light: Blue
- Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Blue
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue