Groat et al.(1998) proposed recently that wiluite, a boron-bearing variety of vesuvianite, is a new mineral species. Unfortunately, the authors did not refer to the results of numerous previous investigators of wiluite, which resulted in the inaccurate description of both the internal structure and optical properties of wiluite crystals. Here, we critically discuss some of their results. The group “vesuvianite” is absent in Mandarino (1999), although Semenov et al. (1981) did discuss the vesuvianite group in their Mineralogical Tables.

Wiluite has been known more than 200 years (Lyachovich 1954). That it is the boron-bearing variety of vesuvianite was determined...

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