Two Generations of Calcite from Missouri

Contributed by: Chris Clemens
Date: Apr 28th, 2026
Locality: Missouri, USA (See on Mindat)
Size: 44 x 36 x 69 mm

Description:
This is an interesting specimen consisting of what appears to be two generations of calcite and areas of drusy quartz, on a limestone matrix. This specimen is from Missouri (no other location information available) and shows a similar response under all UV wavelengths- the calcite shows creamy white fluorescence with green phosphorescence. The quartz is not fluorescent.

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

Fluorescence under longwave UV light.

Afterglow after exposure to longwave UV light.

Fluorescence under shortwave UV light.

Afterglow after exposure to shortwave UV light.

Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: White
• Afterglow after exposure to Longwave (365nm LED) UV light: Green
• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: White
• Afterglow after exposure to Shortwave (254nm Lamp/Mercury) UV light: White