Pyrite

Splashery stretches a drumhead over this Splash's outline, twelve inches across, and finds the ways it can ring. Its lowest is 333.6 Hz, 79 cents flat of F4, the nearest tine on the comb. The next fifteen are its overtones, and each one draws its own figure: sand gathers on the lines that stay still.

Tap it to turn it over; drag to turn it yourself.

A specimen of pyrite, scanned and drawn with splats. Pyrite is iron sulfide; its brassy shine fooled many prospectors, so it is called fool's gold. Its crystals often grow as little cubes, with faces as flat as if they had been cut.

Tap it and it turns half way round to show its other side, so the light runs across its faces, then turns back.

This link opens it in the Playground. To put it on your own page, add the element and one script tag. Every option.