Countries

USA

1st Place
1984 Photomicrography Competition

John I. Koivula

Gemological Institute of America
Carlsbad, California, USA

Subject Matter:

Inclusions of goethite and hematite in Brazilian agate

- see: Agate
Magnification
30x
Technique:

Transmitted Light with Reflected Fiber-optic Illumination


see: reflected light, fiber optic