Fluorescent Mineral Database

Calcite, Hydrozincite and Powellite - Shadow Hills, Mojave Desert, California

Contributed by: FMS Admin
Date: May 27th, 2026
Locality: Shadow Mountain group (Gold Hill claim group; Glory claim group; Yucca Lilly claim group; Foster Mines; Grey Copper Mine; Balboa claim group), Shadow Mountain, Shadow Mts [1], San Bernardino County, California, USA (See on Mindat)

Description:
Here is a nice little specimen that was from a selection of handouts for kids at a local show. Calcite (red), Hydrozincite (blue), Powellite (yellow) from the Shadow Hills area in the Mojave Desert in California. A very nice little piece that proves not all beautiful rocks have to be expensive.

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

Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.
Normal light.
Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
Hydrozincite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
Powellite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Yellow

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