Fluorite, Calcite, Smithsonite, Willemite - Hogan Claim, Arizona

Contributed by: FMS Admin
Date: May 3rd, 2026
Locality: Great Southern Mine, Monarch Wash area, Black Rock Mining District, Yavapai County, Arizona, USA (See on Mindat)
Weight: 2 lb

Description:
If I had to pick the top five fluorescent localities in the world, I would pick the Hogan Claim in Arizona as one. They are bright and exciting. This is a 2-pound piece under MW+SW. The small piece broke off during shipping, but I am not complaining.

Originally posted by UV Studio on Nature's Rainbows in 2016.

Fluorescence under midwave and shortwave UV light.

Normal light.

Photo booth with specimen under midwave and shortwave UV light

Photo booth with specimen.

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: Green