Distribution, thickness, appearance, surface texture, surface gloss, permeability. Composition by weight and by volume. Nature of organic portion. Soluble and insoluble proteins. Maturation by change of calcified portion.
Prisms run differently in longitudinal and transverse sections.
Size, markings and shape in cross section of prism. Prisms made up from crystallites of calcium hydroxyapatite. Orientation and effect on tissue appearance. Position of spaces, distribution of organic component. Effect of markings - incremental lines, brown striae of Retzius.