Diopside - Lake Valhalla, Montvale, New Jersey

Contributed by: Mark Cole
Date: Mar 19th, 2026
Locality: Lake Valhalla Quarry (Gordon\'s Crystalline Limestone Quarry), Montville Township, Morris County, New Jersey, USA (See on Mindat)

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

Fluorescence under shortwave UV light.

Summary of luminescence responses:

Diopside (Mindat) (RRUFF)

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