Tiger's Eye $6.00

Tiger Eye is a metamorphic rock composed mainly of quartz with parallel inclusions of fibrous crocidolite, which have been replaced by silica. These flat, polished specimens showcase the material’s distinctive golden to reddish-brown bands and chatoyancy—a light-reflective optical effect that gives the surface a silky, shifting appearance. Features: Composition and Formation: Tiger Eye forms when quartz replaces fibrous blue crocidolite (a type of asbestos) in a process known as pseudomorphism, preserving the fibrous texture while creating a hard, durable stone. Optical Properties: The shimmering, banded appearance—known as chatoyancy or “cat’s eye” effect—occurs due to the alignment of microscopic fibers within the quartz. Geologic Context: Commonly found in South Africa and Western Australia, Tiger Eye is often associated with banded iron formations and ancient metamorphic rock zones. Educational Use: This polished sample is ideal for illustrating mineral replacement, light interference in crystal structures, and metamorphic processes. A visually striking example of how geologic time and chemistry create natural beauty, these specimens are suitable for teaching, display, or hands-on study.