Dominican Amber (La Toca Fm., 20.43-13.65 Ma)
5.4g piece of amber from the La Cumbre Mine, measuring (mm) 28x24x18. It has a couple marcasite inclusions: visible here, is a protruding portion (one half remains inside the piece) that was perhaps a gas bubble, but later infiltrated with iron and sulfur in solution, via a natural fracture/microfracture; the other is a natural fracture viewable on the opposite side, infiltrated and completely coated by marcasite: the thin film that begins at the rough, unbroken exterior (underside of specimen in picture). There are dozens of visible dual-phase, countless single-phase, and at least two triple-phase bubbles. These are easily seen in the other four related photos of the finished specimen. "Pyrite disease" is a major concern with this specimen; even with preservation in an airtight container, oxidation is still possible, given the presence of gas/liquid inclusions, and the fact that water and gases do penetrate and migrate within amber over time. Portions of the piece may be doomed, but it is interesting while it lasts.
Copyright
From the album:
Fossil Amber and Copal: Worldwide Localities
· 168 images- 168 images
- 2 comments
- 28 image comments
Photo Information
- Taken with SAMSUNG SAMSUNG WB35F/WB36F/WB37F
- Focal Length 4.3 mm
- Exposure Time 1/33
- f Aperture f/3.1
- ISO Speed 100
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