Calcite Crystals on Fluorite - Mongolia
Contributed by: Mark Cole
Date: Apr 7th, 2026
Locality: Choir-Nyalga basin, Töv Province, Mongolia (See on Mindat)
Size: 2 x 1.5 x 3 inches
Weight: 6 oz
Description:
Had a great time at Tucson and found lots of new material. This was one of my favorite finds - Calcite crystals on fluorite crystals - shown LW, SW, and white light. The calcite is very phosphorescent and offers a striking contrast to the bright blue fluorite. This is apparently a new discovery out of China.
Originally posted by Mark Cole on Nature's Rainbows in 2019.
Summary of luminescence responses:
Fluorite (Mindat) (RRUFF)
- Fluorescence under Longwave (365nm LED) UV light: Blue
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
- Fluorescence under Longwave (365nm LED) UV light: White
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: White
- Afterglow after exposure to Shortwave (254nm Lamp/Mercury) UV light: White