In volatile-rich fluorapatite, which represents 70 % of all fission track age-determinations, tracks produced along the trajectories of fission fragments have been considered to be cylinders of radiation-damaged amorphous material, similar to tracks in other minerals, such as zircon [1]. The atomic-scale structure of unetched fission tracks controls temperature-induced “fading” and finally lead...

The effect of dentifrices and toothbrushing on the wear of enamel, exposed dentin, and cementum has been the topic of extensive experimental research.1-3 Little attempt has been made, however, to study the mechanisms that control the surface failure of enamel under an applied stress that results primarily from sliding. To identify the wear phenomenon of enamel at the level of slip or cleavage i...

The present study describes the influence of potassium and hydroxyl substitutions on structural, thermal mechanical properties fluorapatite bioceramics. A set non-stoichiometric ion-substituted compounds, with a chemical formula Ca10−xKx(PO4)6F(2−2x)(OH)x 0 ≤ x 1 synthesized by wet precipitation method, were found to be single-phase apatites crystallizing in hexagonal P63/m space group. structu...

The article presents the results of first study stage aimed at analyzing luminescent properties main and minor minerals composing apatite–nepheline ores host rocks in deposits Khibiny rock massif (Kola Peninsula, Russia). purpose work was a search stable identification feature providing fast safe determination fluorapatite mineral mixture solving technological tasks, namely sampling borehole wa...

the dalir phosphate horizon is located ~57 km southwest of chalous, mazandaran province. the horizon developed as stratiform within upper shale of soltanieh formation (late neoproterozoic - early cambrian). according to mineralogical data, the major minerals of the phosphate horizon are calcite, fluorapatite, dolomite, quartz, pyrite, muscovite, and illite. microscopic evidence such as existenc...