The multicolored rock from the Pilbara region of Western Australia is extremely old – formed from iron-rich sediments deposited in ancient seas about two and a half billion years ago. After millions of years, the sediments crystallized to form layers of hematite, magnetite and jasper, seen here as red-orange, silver and green bands.

At some point, tectonic activity buckled the rock, opening fractures that became infilled with the fibrous mineral crocidolite. As the fibers were crystallizing, they were encapsulated by quartz. Iron oxides were also trapped by the quartz and imparted a golden color.

Like the sheen seen in silk, light reflecting off the golden quartz fibers produces a chatoyancy known as tiger’s-eye. This decorative gem material is commonly polished to make beads and large cabochons.

Source: https://www.gia.edu/gia-museum-exhibit-tigers-eye-quartz

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