Tiger eye rocks are formed through a process of metamorphism, which is the transformation of rocks under the influence of heat, pressure, and fluids. The original rock, usually a type of iron-rich sediment, is subjected to intense heat and pressure, causing its minerals to recrystallize. During this process, the iron oxide minerals hematite and limonite are aligned in parallel bands, giving the rock its distinctive chatoyant (iridescent) appearance. The color of tiger eye rocks can range from golden yellow to reddish brown, depending on the iron content and the degree of metamorphism.

The specific steps involved in the formation of tiger eye rocks are as follows:

1. Sedimentary rock formation: Iron-rich sediments, such as iron oxides and clays, are deposited in a sedimentary environment, such as a river delta or a shallow sea.

2. Burial and compaction: The sediments are buried under layers of other sediment and subjected to increasing pressure and temperature as they sink deeper into the Earth's crust.

3. Metamorphism: As the sediments are further heated and compressed, they undergo metamorphism, a process that changes the mineral composition and texture of the rock.

4. Recrystallization and alignment of minerals: During metamorphism, the iron oxide minerals hematite and limonite within the rock recrystallize and align themselves in parallel bands. This alignment is responsible for the chatoyant effect of tiger eye rocks.

5. Cooling and uplift: After metamorphism, the tiger eye rocks cool and are eventually uplifted to the surface through geological processes such as mountain building or erosion.

Tiger eye rocks are typically found in association with other metamorphic rocks, such as quartz, mica, and amphibole. They are commonly used in jewelry and other decorative applications due to their attractive appearance and chatoyant effect.