The classification scheme of Hill and Forti, as used in the second edition of Cave Minerals of the World, is presented as a "practical" solution to the classification of cave minerals and speleothems. Classification and naming of cave minerals is by crystal class and follows nomenclature approved by the International Mineralogical Association. Classification of speleothems is based on morphology and whatever is known about origin, with division of speleothems into types, subtypes, and varieties. It is proposed that new speleothem types, subtypes, and names be approved by a UIS Commission of cave mineralogists.
Hill, Carol A. and Paolo Forti.
The classification of cave minerals and speleothems.
International Journal of Speleology,
Available at: http://scholarcommons.usf.edu/ijs/vol24/iss1/5