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This paperreports observations of etched internal {0001}, {101̅ 0}, {112̅0}, {101̅1}, and {112̅1} surfaces of Durango apatite. Three types of surfaces are distinguished: P type, S type, and T type. After initially acquiring a certain roughness, P-type surfaces grow smoother with etching time. S-type surfaces remain smooth for long etching times. T-type surfaces develop a progressively coarser texture. Polishing scratches are flat bottomed in P-type, sharp in S-type, and indistinct in T-type surfaces. Fission tracks are funnel shaped in P-type surfaces but simple channels in S- and T-type surfaces. Several lattice defects other than fission tracks are revealed in P-type surfaces but not in S- and T-type surfaces. S-type surfaces can retain the imprints of fission tracks after they have been etched out. The etching velocity perpendicular to the surface increases in the order of P, S, T. Track density is approximately the same in all surfaces near the limit of track revelation but diverges with prolonged etching. It decreases in P-type surfaces, remains fairly constant in T-type surfaces, and increases in S-type surfaces. These trends are partly explained by the interplay between the track geometries and the track-determination criteria. The classic ν b -ν t model fails to explain these track geometries or their dependence on surface orientation. An alternative model is proposed, based on the theories of crystal growth and dissolution. This model implies that the efficiency of fission-track counts cannot be calculated on the basis of etching velocities. It further predicts that confined track lengths do not increase indefinitely with etching time, and that the lengths of surface tracks decrease.

Observations on the geometry of etched fission tracks in apatite: Implications for models of track revelation