1983 Photomicrography Competition
![Small World](/images/SW50-logo.png)
![](https://www.nikonsmallworld.com/images/photos/1983/_photo800/1983_17.jpg)
17th Place
Amber polished to view dendritic air bubbles trapped between sequential flowlayers
John I. Koivula
- Affiliation
- Gemological Institute of America
Carlsbad, California, USA
- Technique
- Brightfield
- Magnifaction
- 40