Calcite Cleavage Rhomb - Utah

Contributed by: Chris Clemens
Date: Apr 28th, 2026
Locality: Utah County, Utah, USA (See on Mindat)
Size: 50 x 32 x 59 mm
Weight: 146 g

Description:
Colorless, translucent, calcite cleavage rhomb from an unknown location in Utah. Looking somewhat average under visible light, it shows an unexpectedly bright orange, fluorescent response under shortwave UV. Under longwave UV it fluoresces a dim red/pink.

Originally posted by Chris Clemens on Nature's Rainbows in 2017.

Fluorescence under shortwave UV light.

Fluorescence under longwave UV light.

Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
• Fluorescence under Longwave (365nm LED) UV light: Red