Opal

Opal is hydrated silica — SiO₂·nH₂O — which means it carries water within its structure. That is unusual. Unlike most gemstones, it is not a true crystal; it is a mineraloid, formed when silica solution fills cavities in rock and hardens slowly over millions of years. The colour play — called opalescence — comes from tiny silica spheres arranged in regular patterns, diffracting light like a prism. No two pieces show the same shifting arrangement of colour.

The name comes from the Sanskrit upala, meaning precious stone, and passed into Greek as opallios, meaning to see a change of colour. The Romans called it the most precious of all stones. Arabian tradition held that it fell from heaven in a flash of lightning. By the nineteenth century, Australia's vast deposits had made opal the national stone — and it remains the primary source of the finest specimens.

The tradition places opal at two quite different centres of the body: the sacral chakra, where it keeps company with the water element, and the crown, where the play of inner light finds its other home. Libra is its zodiac sign. The intentions gathered around it — intuition, love, clarity — share this duality between the felt and the seen.

The suggestion is practical and unhurried. Keep a piece where light reaches it through the day — a windowsill, a bedside table — and let the shifting colours become a quiet anchor. When you glance at it, let the glance carry a word back to your practice: clarity, openness, whatever the day requires. The opal holds nothing by itself; it simply waits for yours.