Hi, Readers of MSA-talk may find this paper of interest, recently published and open access It discusses the definition of a mineral species Ontology, archetypes and the definition of 'mineral species' Frank C. Hawthorne, Stuart J. Mills, Frédéric Hatert, Mike S. Rumsey https://www.cambridge.org/core/journals/mineralogical-magazine/article/ontology-archetypes-and-the-definition-of-mineral-species/88E26EBDE1E7AE7FBB642F147B46A9CD Thanks Helen Dr Helen Kerbey Production Editor, Mineralogical Magazine Mineralogical Society of Great Britain and Ireland https://www.minersoc.org/ @MinSoc_UK, #Minermag 12 Baylis Mews, Amyand Park Road, Twickenham, Middlesex, TW1 3HQ United Kingdom. Tel. +44 (0)29 2051 3901 E-mail: Helen@minersoc.org