In: Anatomy and Physiology
The answer for "f" asked and the necessary description is as follows
Vertebrate Mineralized Tissues
Three of the four hard tissues in the body are bone, cementum
and dentin. It have many similiarities in compositions and
formation. They are connective tissues and collagen. enamel is not
a connective tissue and no collagen, but its formation follows the
formation mechanism of hard connective tissues.
The mineral forms in physiologically mineralized tissues (calcified
cartilage, bone, dentin, and enamel), is an analog of the geologic
mineral, hydroxyapatite.
Vertebrate mineralized tissues (inorganic
components present in) consist of extremely small crystals, mostly
with dimensions of approximately 10–20 × 5 × 5nm.
Geologic hydroxyapatite crystals are quite large and visible to the
naked eye.
The physiologic mineral crystals are microscopic in size, <20 nm
in their longest dimension in bone, dentin, and related
collagen-based tissues, and ~1000 nm in the longest dimension in
enamel.
The crystals in dental enamel have a diameter of 40 nm and,
although still too small to be clearly resolved by the optical
microscope, are considerably larger than those of bone, dentine,
and cementum.
With the exception of enamel, physiologic mineral is deposited in
an oriented fashion on a collagen template.