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© Kaegen Lau

Sumatra Blue Amber (Sinamar Fm., ~30 Ma)

Barrelcactusaddict

By Barrelcactusaddict

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Palm-sized piece roughly 80g in weight. There is a very thin layer of coal on the top and bottom of the piece, making it a good example of a seam-type formation. It's blue coloration is purely surface fluorescence, initiated in this case by a 140 lumen LED light; this fluorescence (especially under a non-LW UV light) is caused by the presence of an exceptionally high concentration of various hydrocarbons contained within the amber.

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© Kaegen Lau

From the album:

Fossil Amber and Copal: Worldwide Localities

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Photo Information

  • Taken with SAMSUNG SAMSUNG WB35F/WB36F/WB37F
  • Focal Length 4.3 mm
  • Exposure Time 1/17
  • f Aperture f/3.1
  • ISO Speed 200
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Barrelcactusaddict

Barrelcactusaddict

Posted

Correction: After reviewing various publications and stratigraphic diagrams of the South Sumatra Basin, and comparing these with information from the seller, I've come to revise the provenance and age of this particular specimen (and others in the lot): it comes from the island of Sumatra, and from the Gumai, Air Benakat, or Muara Enim Formations; the age ranges from ~30-6.3 Ma. There are several different names, which vary by publication, for the Formations throughout the South Sumatra Basin and its Sub-Basins.

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