Brightly Fluorescent Opal from Maine

Contributed by: FMS Admin
minID: 9P3-6NE
Date: May 16th, 2026
Locality: Lord Hill Quarry (Lord Hill Mine), Stoneham, Oxford County, Maine, USA (See on Mindat)
Size: 5.4 x 1.8 x 6.6 mm

Description:
Old-time specimen of brightly fluorescent opal-AN from the Lord Hill Quarry, Stoneham, Oxford County, Maine, recently acquired in a trade. It fluoresces very brightly under shortwave UV (shown in the first picture), and also quite brightly under longwave UV.

Originally posted by Frédéric Messier Leroux on Nature's Rainbows in 2021.

Fluorescence under shortwave UV light.

Fluorescence under longwave UV light.

Normal light.

Summary of luminescence responses:

Opal-AN (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: Green
• Fluorescence under Shortwave (255nm LED) UV light: Green