Goethite

Goethite

GOETHITE OVERVIEW This is a photo of iridescent goethite from Spain. The specimen features hemispherical (botryoidal) shapes with a colorful, iridescent surface. Some people apparently call these “unicorn poop.” This particular piece also has small, round,...
Gibeon Meteorite

Gibeon Meteorite

GIBEON METEORITE OVERVIEW  This is a photo of a Gibeon meteorite (iron, IVA class) fragment from Namibia, featuring the Thomson (Widmanstatten) patterns. I believe the darker areas are kamacite and lighter areas taenite/plessite (1, 2). Nitric acid is used to...