Zunyite - Big Bertha Mine, Arizona
Contributed by: FMS Admin
Date: Feb 21st, 2026
Locality: Big Bertha Mine, Middle Camp-Oro Fino Mining District, Dome Rock Mountains, La Paz County, Arizona, USA (See on Mindat)
Size: 3.8 x 1.6 x 6.4 cm
Description:
Tiny (1mm) colorless to brown zunyite crystals in quartz matrix, fluorescing deep red in SW. Yellow-fluorescing microcrystals of what is likely pyrophyllite appear as grains around and on the zunyite. A macro closeup is included with FOV 20mm.
Originally posted by Dennis Michael on Nature ' s Rainbows.
Summary of luminescence responses:
Zunyite (Mindat) (RRUFF)
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red



