Diopside - Lake Valhalla Quarry, Montville Township, New Jersey

Contributed by: Chris Clemens
Date: Apr 28th, 2026
Locality: Lake Valhalla Quarry (Gordon's Crystalline Limestone Quarry), Montville Township, Morris County, New Jersey, USA (See on Mindat)
Size: 72 x 33 x 81 mm
Weight: 208 g

Description:
Light-colored piece of diopside with a marble-like texture, from the Lake Valhalla Quarry, Montville Township, Morris County, New Jersey. This specimen is nearly solid diopside. Fluoresces bright blue/white under shortwave UV.

Originally posted by Chris Clemens on Nature's Rainbows in 2017.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Diopside (Mindat) (RRUFF)

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