Mindat Short Description
Mn analogue of chloritoid. Ottrélite was originally described as a Mn-rich, but not necessarily Mn-dominant chloritoid, consequently many "ottrélites" are in reality Mn-rich chloritoids, see Chloritoid best minerals article and references therein for f...
Geoscience Ontology Status Notes
Descloizeaux A, Damour A A (1842) De l'ottrélite, nouvelle espèce minérale, Annales des Mines 2, 357-361
IMA Formula (from Mindat)
Mn2+Al2O(SiO4)(OH)2
RRUFF Formula (from Geoscience Ontology)
Mn2+Al2O(SiO4)(OH)2