An unnecssary varietal name for Apatite-(CaF) containing OH in relatively large amounts but less than the F content, includes Voelckerite in part.
Hydroxylian Apatite-(CaF) and fluorian Apatite-(CaOH), often with some CO3 content, constitute the majority of the crystallized apatites and the massive apatite rocks.
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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 884.