Wollastonite - Willsboro, New York

Contributed by: Chris Clemens
Date: Apr 28th, 2026
Locality: Willsboro, Essex County, New York, USA (See on Mindat)
Size: 51 x 32 x 65 mm
Weight: 159 g

Description:
Collectors of fluorescent minerals are familiar with the bright, warm yellow, fluorescent wollastonite from the Franklin/Sterling Hill, New Jersey area. Here is an interesting specimen, rich in wollastonite that fluoresces moderate white under all UV wavelengths. This mixed assemblage rock is from Willsboro, Essex County, New York, and contains large white crystals of wollastonite, small olive-green crystals of diopside, and large red/brown grains of colophonite, a coarsely granular variety of andradite garnet. Neither the diopside nor colophonite are fluorescent.

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

Fluorescence under shortwave UV light.

Fluorescence under midwave UV light.

Fluorescence under longwave UV light.

Normal light.

Summary of luminescence responses:

Wollastonite (Mindat) (RRUFF)

• Fluorescence under Longwave (365nm LED) UV light: White
• Fluorescence under Midwave (305nm Lamp/Mercury) UV light: White
• Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: White