『Abstract
　A simplified definition of a mineral group is given on the basis of structural and compositional aspects. Then a hierarchical scheme for group nomenclature and mineral classification is introduced and applied to recent nomenclature proposals. A new procedure has been put in place in order to facilitate the future proposal and naming of new mineral groups within the IMA-CNMNC framework.

Key-words: mineral group; supergroup; nomenclature; mineral classification; IMA-CNMNC.』

Introduction
History
Definition of a mineral group
Structural aspects of a mineral group
Compositional aspects of a mineral group
A hierarchical scheme for group nomenclature
Definitions of the group levels
The naming of the group and supergroup levels
Procedure for the introduction of mineral groups and supergroups
Subgroup vs. Group in previous publications
Family vs. Supergroup vs. Group in previous publications
Application of mineral group hierarchies to recent nomenclature proposals
Conclusion
References

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