Fluorescent Calcite and Fluorite from the North Geronimo Mine
Contributed by: FMS Admin
Date: Feb 24th, 2026
Locality: North Geronimo Mine, Silver Mining District, La Paz County, Arizona, USA (See on Mindat)
Size: 3 x 2 x 4 inches
Weight: 13 oz
Description:
The North Geronimo Mine, also known as the Pure Potential Mine, is located in the Trigo Mountains, La Paz County, Arizona. The matrix of this piece is calcite and it is broken up with veins of fluorite. It fluoresces under SW, LW and MW ultraviolet light and the pictures are presented in that order.
Fluorescent pictures were taken at ISO-100, f/11 for 0.6 seconds.
Originally posted by John Rofrano on Nature's Rainbows.
Summary of luminescence responses:
Fluorite (Mindat) (RRUFF)
- 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
- Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Red
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red