The official classification of meteorites in The Meteoritical Bulletin, must be done through the procedures established by the Nomenclature Committee of The Meteoritical Society. According to this, the procedures entail the donation of samples (type specimen), the payment of the analyses that are necessary to carry out, and carry out these analyses.
The procedure requires performing different analyses, and these entail laboratory fees that need to be paid.
The Meteoritical Society says; The minimum mass of a type specimen should be 20% of the total mass or 20 g, whichever is the lesser amount. For newly paired meteorites from dense collection areas, the minimum required mass shall be whatever is needed to bring the aggregate mass of existing type specimens (if any) to 20% of the aggregate mass of the entire pairing group or 20 g, whichever is less. Larger type specimens are recommended (...) for meteorites larger than 100 g:
Mass (to classify) Recommended type specimen.
1 gr - 300 gr at least 20 % of total mass
301 to 500 gr at least 50 gr
501 to 1000 gr at least 65 gr
1001 to 5000 gr at least 100 gr
5001 to 10 kg. at least 250 gr
More than 10 kg at least 500 gr