Silica scatters light to give some springs their famous milky-blue colour, and leaves a soft, almost lotioned feel on the skin.
Silica is why the Blue Lagoon looks the way it does: suspended silica nanoparticles scatter sunlight the same way the atmosphere makes the sky blue, turning the water an opaque, luminous blue-white. On the skin it forms a fine, soft layer that many describe as silky or "lotioned." Silica-rich water is most associated with skin: it is the mineral in the white mud masks at Icelandic lagoons, and interest in it is rising fast in search.
How you'll know it
Opaque, milky blue-white water (think Blue Lagoon) and a silky feel on the skin.
Traditionally good for
Associations from long use and emerging research — restorative, not medical claims.
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Associated with smoother, hydrated-feeling skin
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The basis of silica mud masks at geothermal lagoons
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Gentle and well-tolerated by most skin types
Good to know
Silica is rough on hair — tie it up and rinse thoroughly, or it can feel dry and tangled afterward.
Springs rich in silica
Sources & further reading
For general interest, not medical advice. Benefit claims reflect long tradition and emerging research; the strength of evidence varies by mineral and condition.