Fluorescent Quartz, Cato Township, Wisconsin
Contributed by: Chris Clemens
Date: Apr 23rd, 2026
Locality: Manitowoc County, Wisconsin, USA (See on Mindat)
Size: 7.6 x 6.4 x 10.2 cm
Weight: 685 g
Description:
This is an interesting specimen of colorless, banded, quartz that was dug up in a farm field in Cato Township, Manitowoc County, Wisconsin. Under shortwave UV, a blue, banded, fluorescent response is seen with teal green streaks. The longwave response is a more uniform blue/purple color. This specimen is also dimly phosphorescent following exposure to shortwave UV.
Originally posted by Chris Clemens on Nature's Rainbows in 2016.
Summary of luminescence responses:
Quartz (Mindat) (RRUFF)
- Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Violet
- Fluorescence under Longwave (365nm LED) UV light: Violet