Fluorescent Mineral Database

A new secret project! Trying to create a nice Fluorescent Mineral Database (FMDB), which would be searchable by mineral, locality, and luminescence properties. Also making it easy for people to contribute with their own specimens!

Layer Cake - Chondrodite, Calcite, Diopside, Hydrozincite, Aragonite - Long Lake Zinc Mine - Ontario

Contributed by: Mark Cole
Date: Apr 2nd, 2026
Locality: Long Lake Zinc Mine (Richardson Zinc Mine; Lynx Mine), Olden Township, Frontenac County, Ontario, Canada (See on Mindat)

Description:
Exceptional examples of the complex mineralogy at the Long Lake Zinc Mine in Canada. Only a couple of specimens like this were collected from one large boulder. They show the sedimentary action which created these rocks. This piece even has a nice vug of calcite crystals - almost unheard of from this mine. Second pic shows a similar vug on another specimen from the same find.

Originally posted by Mark Cole on Nature's Rainbows in 2015.

Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light. Second specimen.
Fluorescence under shortwave UV light. Second specimen.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
Chondrodite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Yellow
Hydrozincite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
Aragonite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: White
Diopside (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue

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