composite grain

composite grain

[kəm′päz·ət ′grān]
(geology)
A sedimentary clast formed of two or more original particles.
References in periodicals archive ?
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 structure.
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.