1988 Photomicrography Competition
12th Place
1988 Photomicrography Competition
John I. Koivula
Gemological Institute of America
Carlsbad,
California, USA
- Subject Matter:
Inclusions of pyrolusite and limonite in a polished slab of Brazilian agate
- see: Agate (14x)- Technique:
Brightfield
see: brightfield