Fluorite Cubes on Calcite - Pint's Quarry, Raymond, Iowa

Contributed by: Chris Clemens
minID: DW3-P8E
Date: May 19th, 2026
Locality: Pint's Quarry, Raymond, Black Hawk County, Iowa, USA (See on Mindat)
Size: 46 x 27 x 66 mm
Weight: 67 g

Description:
Scalenohedral calcite crystals with minor marcasite and small, brown/amber, cubic fluorite crystals, on limestone matrix. From Pint's Quarry, Raymond, Black Hawk County, Iowa. This specimen shows a similar fluorescent response under all UV wavelengths - the calcite fluoresces a soft honey-yellow with zones of purple, and the fluorite cubes show a bright cream/white response. Both minerals are also phosphorescent.

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

Fluorescence under longwave UV light.

Normal light.

Fluorescence under longwave UV light. Closeup

Normal light. Closeup

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: Yellow

• Fluorescence under Longwave (365nm LED) UV light: White