Laumontite on Prehnite from India

Contributed by: FMS Admin
Date: Mar 8th, 2026
Locality: Pune Division, Maharashtra, India (See on Mindat)

Description:
Laumontite fluoresces medium bright off-white. The prehnite matrix fluoresces extremely weak green.
Locality: Pune, Maharashtra State, India. The fluorescence is most likely due to organic matter: humic acids.

Source: Fluorescent Minerals Workgroup MKA : http://fluo.mineralogie.be/

Originally posted by Axel Emmermann on Nature's Rainbows.

Fluorescence under longwave UV light.

Normal light.

Summary of luminescence responses:

Laumontite (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: White