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!

Margarosanite and Calcite from the Jakobsberg Mine, Filipstad, Värmland, Sweden

Contributed by: Chris Clemens
minID: 5N4-K79
Date: Apr 22nd, 2026
Locality: Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County, Sweden (See on Mindat)
Size: 43 x 16 x 80 mm
Weight: 47 g

Description:
This rock is from the Jakobsberg mine, Filipstad, Värmland, Sweden, and consists of a fine grained, olive/tan colored matrix with calcite inclusions and a visible white encrustation of margarosanite. As seen in the photograph below, taken under short wave UV, the margarosanite fluoresces bright blue and the calcite red. Other than Franklin, New Jersey, the Värmland area of Sweden is the only other known source for margarosanite.

Originally posted by Chris Clemens on Nature's Rainbows in 2018.

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

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