Beautiful Midwave UV Fluorescent Calcite - Putnam County, Indiana

Contributed by: Chris Clemens
minID: D4U-GX9
Date: May 20th, 2026
Locality: Putnam County, Indiana, USA (See on Mindat)
Size: 30 x 26 x 64 mm
Weight: 30 g

Description:
White to tan-colored, bladed calcite crystals on a matrix of solid granular calcite. This specimen was collected from an unknown limestone quarry in Putnam County, Indiana. As seen in the photograph below, the calcite shows a beautiful pink/red colored fluorescent response under midwave UV.

Originally posted by Chris Clemens on Nature's Rainbows in 2018.

Fluorescence under longwave UV light.

Fluorescence under midwave UV light.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm Lamp/Mercury) UV light: White
• Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Red
• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red