Wollastonite, Calcite, and Hydrozincite - Big Yellow Mine, Utah

Contributed by: Chris Clemens
Date: Apr 25th, 2026
Locality: Beaver County, Utah, USA (See on Mindat)
Size: 37 x 32 x 43 mm
Weight: 43 g

Description:
This is a small, but spectacular fluorescent specimen, collected in 2016 from the Big Yellow Mine, located on the back side of Indian Grave Peak, northwest of Frisco, Beaver County, Utah. This rock contains yellow fluorescing wollastonite, red/orange fluorescing calcite, and blue fluorescing hydrozincite, all seen under shortwave UV (254nm).

Originally posted by Chris Clemens on Nature's Rainbows in 2016.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

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

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

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