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!

"Swedish Flag" - Margarosanite, Wollastonite, Calcite - Jakobsberg, Sweden

Contributed by: Mark Cole
Date: Apr 5th, 2026
Locality: Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden (See on Mindat)

Description:
From the collection of Howie Green, "Swedish Flag" is perhaps the most striking fluorescent mineral that is found in the area around Langban, Sweden. Named for the colors of the country, the wollastonite is a nice bright yellow, margarosanite a beautiful blue - all against the red calcite backdrop. Not easy to find - this specimen comes from the Jakobsberg Mine, close to the famous Langban mining area.

Originally posted by Mark Cole on Nature's Rainbows in 2016.

Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
Margarosanite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
Wollastonite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Yellow

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