Fluoborite - Bodnar Quarry, Rudeville, New Jersey

Contributed by: Chris Clemens
Date: Apr 25th, 2026
Locality: Edison-Bodnar Quarries, Rudeville, Hardyston Township, Sussex County, New Jersey, USA (See on Mindat)
Size: 4.9 x 4.3 x 6.8 cm

Description:
Crystals of light grey fluoborite in a groundmass of white Franklin marble, from the Bodnar Quarry, Rudeville, Hardyston Township, Sussex County, New Jersey. Under shortwave UV the fluoborite shows an off-white fluorescent response, and the marble fluoresces dim blue. There is also an unidentified mineral present that fluoresces dim red/orange under shortwave UV.

Fluoborite is a rare hydrothermal mineral which contains fluorine and boron, hence the name "fluo-bor-ite".

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

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Fluoborite (Mindat) (RRUFF)

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: White