Banded Calcite – Medford Quarry, Carroll County, Maryland

Contributed by: Mark Cole
Date: Mar 18th, 2026
Locality: Medford Quarry, Medford, Carroll County, Maryland, USA (See on Mindat)

Description:
Originally posted by Mark Cole on Nature's Rainbows in 2015.

Fluorescence under shortwave UV light.

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