What type of aggregate is tiger's-eye quartz classified as?

Tiger's-eye quartz is classified as cryptocrystalline. This classification indicates that the stone is composed of many tiny crystals that are not visible to the naked eye. In cryptocrystalline aggregates, the individual crystals can only be detected under high magnification, as they are generally too small to discern in the bulk material.

Tiger's-eye quartz is specifically known for its fibrous structure and chatoyant appearance, which results from the unique arrangement and orientation of its microscopic fibers. These fibers are made of quartz and other mineral inclusions, which contribute to its striking visual characteristics. The cryptocrystalline nature of tiger's-eye is important in distinguishing it from other types of aggregates because it implies a specific growth pattern and mineral composition that defines the stone's overall properties and aesthetic appeal.

This is contrasted with other types of aggregates, such as monocrystalline, which consists of a single continuous crystal, or polycrystalline, which contains multiple larger crystals that can be seen individually. Granular refers to a texture where the crystals are more distinct and can be identified easily at a glance, which is not the case for the fine fibrous structure present in tiger's-eye quartz.