Photomicrographers

John I. Koivula

Honorable Mention
1986 Photomicrography Competition

John I. Koivula

Gemological Institute of America
Carlsbad, California, USA

Subject Matter:

Thin wafer of synthetic ruby corundum (rock-forming mineral)

- see: Mineral
Magnification
40x
Technique:

Polarized Light


see: polarized light