A sedimentary rock consisting predominantly of apatite along with other phosphates.
a sedimentary stone full of phosphate nutrients such as for example apatite
an enormous number of apatite.
A name applied originally to a huge selection of apatite, nevertheless now familiar with embrace the greater or less impure earthy to compact calcium phosphate which forms bedrooms of considerable magnitude in some localities (Estremadura in Spain, Bohemia, etc.), and it is of much economic importance.