Does coal not sparkle because of its colour or because light does not refract / reflect from the cut facets? Thanks!
In: Physics
Coal doesn’t sparkle because it’s not a crystalline solid, and it’s not transparent. It has randomly distributed particles so any light that falls on it gets absorbed (because it’s black), or reflected in random directions and difused. Light that falls on a cut diamond gets focused by internal reflection into certain paths, which is why you see “no sparkle-blinding sparkle-no sparkle-again” when you rotate it.
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