Opals and Opaline Materials

Play-Of-Color

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Making Synthetic Opal Sedimentation of Monodisperse Colloidal Silica Particles

Particles: https://www.synthetic-opals.com/synthetic-opal-shop.html#!/Monodisperse-Silica-Particles-Dispersion-30-wt-50-ml/p/534348848/category=0

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Montana Agate

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Hand-carved Fish with Opal Sphere

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Banded Opal

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Opal

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Opal

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Aurora Opal

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Liquid Opal - Crystallization of Colloidal Particles (Microscopic Image)

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Opal

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looking on how to make Sedimentation based synthetic opal

You need monodisperse silica particles in the right size, water, a lot of time and something to fill the pores :-)