Wollastonite and Diopside - a new find in the area around the Cupric Mine (Iron Devil Mine) near Milford, Utah

Contributed by: Mark Cole
Date: Apr 14th, 2026
Locality: Cupric Mine (Iron Devil mine), San Francisco Mining District, Beaver County, Utah, USA (See on Mindat)

Description:
Chris Powell from the Fluorescent Mineral Facebook Group made a new find in Utah. It is fluorescent blue and yellow and is quite heavy. XRD testing revealed that it is wollastonite and likely diopside. Found near the area of the Cupric Mine (Iron Devil Mine) near Milford Utah.

Originally posted by Mark Cole on Nature's Rainbows in 2016.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Diopside (Mindat) (RRUFF)

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

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