Excellent - world class for species or very significant. (!!)
Confirmation
Validity:
Believed Valid
References
References:
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 648; Bottrill & Baker (in prep) Catalogue of minerals of Tasmania