Quasicrystals, once considered impossible, were found in a 3D-printed aluminum alloy – and they make it stronger. This could ...

Selling your gemstones Selling your birthstones Selling crystals ... an opal. Rare opals can sell for hundreds to thousands ...

There are perhaps a dozen of these rare crystal skulls ... the manufacture of most of the skulls to an area of Germany famous for manufacturing intricate quartz and crystal designs in the late ...