Talc - Gouveneur Talc Co. Mine, Balmat, New York

Contributed by: Chris Clemens
Date: Apr 24th, 2026
Locality: Balmat, Fowler, St. Lawrence County, New York, USA (See on Mindat)
Size: 40 x 19 x 52 mm

Description:
Mass of platy, cream/white-colored talc crystals, from the Gouveneur Talc Co. Mine, Balmat, New York. This specimen shows an interesting, nearly monochromatic fluorescent response, fluorescing a creamy-white/yellow color under shortwave UV, and yellow/grey under longwave UV.

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

Fluorescence under shortwave UV light.

Fluorescence under longwave UV light.

Normal light.

Summary of luminescence responses:

Talc (Mindat) (RRUFF)

• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: White
• Fluorescence under Longwave (365nm LED) UV light: Blue