Sapphire is a crystal form that is very hard, and it looks like a diamond. These crystals come in many colors, such as orange, purple, green, yellow and red. And the most famous is the red, which is often called rubies.
In addition, crystals of this one was quite expensive. More recently came the news, if the giant American smartphone, Apple, will make a scratch-resistant screen of the crystal stone. Certainly not easy and inexpensive to develop.
But in a report showing, if Apple was investing money to develop a scratch-resistant sapphire glass. The first time they will purify the stone that has been mined, separated from iron, titanium, chromium, copper, or magnesium which makes color as usually found in the mine.
So that the resulting screen will not color. As for the strength of sapphire crystal used Mohs scale, where diamond has a strength of about 10 Mohs, and for sapphire crystal has the power 9 Mohs.
However, there are constraints in terms of cost, where the manufacture of glass scratch would cost about 10 times that of Gorilla Glass. So it is not possible if a smartphone that will be produced has relatively more expensive price.
But Apple itself has not been willing to release products using a scratch-resistant sapphire glass this.
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