Rainbow lattice sunstone is beautiful

This intriguing chunk of feldspar looks like ribbon confetti neatly arranged in resin. According to this site, Rainbow lattice sunstone "contains crystallographically oriented exsolutions of Illmenite & Hematite that forms a criss-cross lattice pattern which produces spectral colour aventurescence in reflected light." In other words, a wizard made it.

The Opal's Fire

Opals, a rainbow of fire locked in rock, are among the most wonderful of nature’s gifts. Maggie Koerth-Baker returns with the light truth about weird silica.

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