Diopside in Calcite, Fort Ann, New York

Contributed by: Chris Clemens
Date: Apr 25th, 2026
Locality: Fort Ann, Washington County, New York, USA (See on Mindat)
Size: 33 x 30 x 38 mm

Description:
Grains of brightly fluorescent diopside with minor non-fluorescent pyrite in a calcite groundmass, from the Rt. 4 Roadcut, Fort Ann, Washington County, New York. Under shortwave UV, the diopside fluoresces bright blue/white.

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

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Diopside (Mindat) (RRUFF)

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