For sale is a very rare ordontilite from an unknown location, most likely USA, but not sure. This huge for the species, came out of Bernie Whytes collection, unfortunately with no accompanying references. To quote Alfredo Petrov "Bone starts as the mineral Hydroxylapatite (with some organic components too). During long burial in soil, some of the hydroxyl part (the "(OH)" in the chemical formula) can slowly get replaced by fluorine (F), and eventually the mineral part turns into the mineral Fluorapatite" there is some fluorescence, yellow color, typical of fluorapatite.
150 x 48 x 39mm