The phrase "aggregate of material" is correct and usable in written English.
It can be used in contexts where you are discussing a collection or total amount of various materials, often in scientific, technical, or academic writing.
Example: "The aggregate of material collected from the excavation site provided valuable insights into the region's geological history."
Alternatives: "collection of materials" or "total amount of material".
Moreover, as already discussed above, the component entities of any aggregate of material entities can be spatially separated.
If we want to refer to an aggregate of material entities that forms a cohesive/connected whole consisting of several material entities we are referring to a cluster.
This possible constellation holds for any aggregate of material entities: every aggregate of material entities can possess immaterial parts (i.e. negative objects: certain types of holes, e.g., tunnels, caves, tubes and hollows), which are continuously connected to the space surrounding the aggregate.
Any type of aggregate of material entities, be it a group or a cluster, cannot be an object: groups of material entities are not objects, because their material entity parts are separated from each other by spatial gaps (Fig. 4).
For example, whenever we want to refer to an aggregate of material entities that exhibits a specific spatial distribution pattern of scattered material entities we are referring to a group.
Definition: A cluster is an aggregate of material entities that is a mereological sum of separate material entities, which adhere to one another through chemical bonds or physical junctions that go beyond gravity.
They appear to be primarily aggregates of material that formed in the solar nebula prior to or during planet formation.
For exposures greater than 3 minutes, it was difficult to find any bacteria on the washers, and only scattered aggregates of material were visible on the washer surface.
In the case of PA01, there remain scattered aggregates of material across the surface of the washer that may be remnants of the EPS, although these were not present in the case of JE2.
In 2002, he received the Best Paper of the Year 2001 Award in London, at the Lord's Cricket Grounds, for a paper published in Engineering Computations, pertaining to modeling and simulation of the propagation of failure in particulate aggregates of material.
The only models of cometary structure astronomers could positively rule out were the very porous ones which had comets as loose aggregates of material.
