What does the term "aggregate" refer to in gemology?

In gemology, the term "aggregate" specifically refers to a mass of tiny, randomly oriented crystals. This definition highlights the structure of an aggregate, where multiple small crystals coexist but do not necessarily form a single, well-ordered crystal structure. This can occur in certain gems where small crystal components are bonded together, creating a composite material rather than a singular crystal. The randomness in orientation means that these tiny crystals do not arrange themselves in a systematic or uniform way, which is characteristic of aggregates.

This concept is important in the study of gemstones as it can influence the appearance, optical properties, and durability of the material. Understanding the properties of aggregates is vital for gemologists because it helps in identifying and classifying different types of gemstones, as well as understanding their formation and growth processes.