(Image: Danny Sanchez)
MAGNESIUM aluminium oxide sure is a pretty mineral. It forms spinel, a gem coveted throughout history and whose red variant is sometimes confused with ruby. It was used in the . And an egg-sized lump of the stuff, known as the Black Prince鈥檚 Ruby, forms the centrepiece of the Imperial Crown. Both pieces are part of the , and there鈥檚 an even bigger rock, the , in the Iranian Crown Jewels.
The spinel in this photo is a tiddler by comparison, but no less beautiful and certainly more intriguing. The field of view of the image is 2.9 millimetres, which makes the floating octahedron in the middle less than half a millimetre wide. But get this: it鈥檚 a 鈥渘egative crystal鈥�. The octahedron is the outline of a space, and what looks at first like the sides of a solid crystal are actually the walls of a void inside a bigger lump of crystal.
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鈥淭his is one of the most shockingly perfect negative crystals I have come across,鈥� says photographer , who is based in Los Angeles. You can see more of his photomicrography at .
This article appeared in print under the headline 鈥淔loating crystal palace鈥�