According to the researchers, when the amount of diopside added to the base of hydroxyapatite increases up to 30 weight percent, the size of final composite grain
and its size distribution significantly decreases after two steps of sintering process.
This technology is based on an electrochemical reaction controlled by varying nanoscale coatings within the composite grain
Some quartz and feldspar are also found in the heavy mineral fraction because of less than perfect separation and/or their presence in composite grains
with heavy minerals.
Theoretical calculations show that over a wide range of wavelengths, the postulated composite grains
have optical properties closely matching those observed in interstellar space.