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Recommended classifications

Recommended classes in the Meteoritical Bulletin Database are assigned by the database editor. In most cases, this is based on the most recent classification that appears in either the Catalogue of Meteorites, MetBase, the US Antarctic Meteorite Newsletter, the Japanese Meteorite Newsletter, or the Meteoritical Bulletin. However, in a few cases it reflects differences of opinion about the proper way to classify the meteorite. The nomenclature used may also be modified by the editor to conform to an internally consistent classification scheme

The recommended classification CR3 means:

"A carbonaceous chondrite of the CR group that is petrologic type 3."

The highlighted words are defined as follows:

carbonaceous chondrite: A major class of chondrites that mostly have Mg/Si ratios near the solar value and oxygen isotope compositions that plot below the terrestrial fractionation line.

CR group: The Renazzo (CR) chemical gorup of carbonaceous chondrites, distinguished by large, abundant porphyritic chondrules (0.7 mm, 50 vol%), many of which have igneous rims, few refractory inclusions, abundant metal (5-8 vol%), and fine-grained matrix that is commonly hydrated (up to 50 vol%).

type 3: Designates chondrites that are characterized by abundant chondrules, low degrees of aqueous alteration, and unequilibrated mineral assemblages. Many of the low-Ca pyroxene grains are monoclinic and exhibit polysynthetic twinning. The type 3 chondrites may be divided into subtypes ranging from 3.00 (least metamorphosed) to 3.9 (nearly metamorphosed to type 4 levels). If primary igneous glass occurs in the chondrules, it belongs to type 3.


Find all meteorites of type: CR3