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© Kaegen Lau

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

Barrelcactusaddict

By Barrelcactusaddict

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4.3g dark, transparent blue amber from West Sumatra. After grinding and polishing, I was surprised to discover that it contains 2 ants and 2 winged ants (possibly wasps); these were a little tricky to photograph, due to the amber's strong fluorescence under 140 lumen LED light, so these inclusions had to be backlit. I used a Canon EOS 500D, Canon 60mm f/2.8 Macro Lens, and combined 2x and 4x Hoya circular magnifier lenses (8x).

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© Kaegen Lau

From the album:

Fossil Amber and Copal: Worldwide Localities

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Photo Information

  • Taken with Canon Canon EOS REBEL T1i
  • Focal Length 60 mm
  • Exposure Time 1/40
  • f Aperture f/10.0
  • ISO Speed 400
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Barrelcactusaddict

Barrelcactusaddict

Posted

Correction: the Hoya close-up filters are marked as "+", not "x". My stacking the 2+ and the 4+ lenses would equal a 6:1 ratio (assuming the main lens is set to 1:1). The image would be 6x magnification, not 8x.

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Barrelcactusaddict

Barrelcactusaddict

Posted

Correction (May 6, 2024):

 

I would more accurately list the inclusions (workers and alates) in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.

 

Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.

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