Iron, IIIE

IIIE Iron meteorites are a rare and well-defined group within Iron meteorite classification, representing material from the metallic cores of differentiated asteroids. Formed over 4.5 billion years ago, they crystallised from molten metal as their parent bodies cooled slowly over time. The ‘IIIE’ designation reflects their specific nickel content and trace element chemistry, which sets them apart from other Iron groups and indicates a distinct core formation history.

IIIE Irons are composed primarily of iron-nickel metal and typically display clear Widmanstätten patterns when cut and etched. These interlocking crystal structures formed during very slow cooling, producing a structured and often medium to coarse pattern depending on composition. Compared to more common groups like IIIAB, IIIE meteorites are less widely encountered, and their structure can show subtle differences linked to their unique chemical profile.

Studying IIIE Iron meteorites provides valuable insight into the diversity of asteroid core formation and cooling processes. Their distinct chemistry helps refine classification systems and improves understanding of how different parent bodies evolved. For collectors, IIIE Irons are highly desirable due to their rarity and clear structural features. Each specimen represents a less common example of ancient metallic core material from the early solar system.