On 09/10/2016 07:31 AM, couryho...@aol.com wrote: > Transparent aluminum exists. It is called sapphire. Sapphire is > the crystalline form of aluminum oxide. If you recall, Apple was > thinking of using it for the touch screen face of the iphone.
Pardon my pickiness, but sapphire isn't aluminum, any more than ruby or corundum is. One might was well refer to it as "oxygen". Sappire is a combination of oxygen and aluminum. In fact, there's more oxygen than aluminum in sapphire. Very thin (micron-thick) layers of metallic aluminum can be transparent, but that's true of many metals. --Chuck
