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Kamacite Globules in Gujba |
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| Meteorite - Gujba, CBa, Bencubbinite. |
| The CB subgroup of carbonaceous
chondrites is characterized by distinct physical features, including metal and
rounded chondrule - shaped structures ranging from 0.4 to 0.6 cm in size. These
structures consist of silicate globules, kamacite nodules, and
cryptocrystalline spherules. The kamacite nodules contain small amounts of
accessory troilite, while the silicate components are primarily composed of
barred olivine and pyroxenes. According to Campbell et al. (2002) and Rubin et al. (2003), the metal and silicate structures might have originated as liquid droplets, potentially formed through condensation within an impact-generated vapor plume on an asteroid or via the evaporation of pre-existing metal particles in such a plume. The accompanying image depicts a prepared section of the coarse-grained CBa chondrite, Gujba. |
| Figure 1. Scale bar 1.3 mm. |
| Prepared section of Gujba. Kamacite globules are light grey. The large structure, upper right, is a cryptocrystalline silicate spherule. There are a lot of structures in Gujba i.e., fragmented breccias, mineralogy altered by heat/shock, terrestrial weathering byproducts, large-sized kamacite globules of unknown formation, etc. A determination of primary/secondary structures is left to others. Input is welcome. |
| Listing of Structures |