LL~4/5 Meteorite Classification

Class Description

The LL~4/5 meteorite classification describes a meteorite from the LL group of ordinary chondrites, which are noted for their low iron and metal content, and it straddles the boundary between petrologic types 4 and 5. This classification indicates a level of metamorphism where the meteorite has undergone changes sufficient to homogenize mineral compositions and begin transforming its structure, but not to the full extent characterized in type 5, where chondrules begin to blur and secondary minerals grow more prominent.

LL~4/5 Meteorite Examples

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