The Rare, Naturally-Occurring “Chalcedony Rose”

Chalcedony Rose Drusy Necklace

Its surface covered by tiny sparkling quartz crystals, this is an especially fine example of a rare, naturally-occurring formation from Rio Grande do Sul, Brazil, known as a “Chalcedony Rose.” No two alike, these cup-shaped specimens form when silica dissolved by water fills open cavities in volcanic rock, slowly depositing layer upon layer. Highly resistant to chemical and physical weathering, the roses are released when the enclosing host rock is weathered away at the surface of the earth.

The blue tones are caused by Rayleigh scattering of light on tiny particles, the mechanism that is also mostly responsible for the blue color of the sky 🙂
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