Calcite, Fluorite, Willemite - Hull Mine, Arizona

Contributed by: FMS Admin
Date: May 25th, 2026
Locality: Hull Mine, Hull Mine group (Rialto Mine group; Hull group of claims; Rialto claims), Buckeye vein group, Castle Dome Mine group, Castle Dome Mining District, Castle Dome Mountains, Yuma County, Arizona, USA (See on Mindat)
Size: 5 x 6 inches

Description:
A really stunning piece from the Hull Mine, in Arizona. Red calcite, blue fluorite, green and greenish white willemite. Note, the willemite is nicely phosphorescent.

Originally posted by Fire Viper on Nature's Rainbows in 2016.

Fluorescence under longwave and shortwave UV light.

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 Shortwave (254nm Lamp/Mercury) UV light: Green
• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: White