Gadget videoblogger Marques Brownlee continues testing a piece of glass he got a couple weeks ago that he believes is the front panel of the upcoming iPhone 6.

We don’t have conclusive proof that this is actually an iPhone 6 screen. But whatever it is, it appears to be a very hard, very flexible, and amazingly engineered material.

In a previous video, Marques attacked the maybe-iPhone-6 screen with keys, a knife blade, and even bent it under his shoe — all to no effect. Whatever this screen is made of, it’s both harder and more flexible than Gorilla Glass.


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In this video, Brownlee attacks the panel with garnet and emery sandpaper — both coated with extremely hard minerals.

Based on his tests, Brownlee shows that the iPhone 6 screen he’s testing is not made of pure sapphire, because it gets scratched by garnet sandpaper — and, according to the Mohs Scale of mineral hardness, garnet is softer than sapphire. In fact, he uncovers an Apple patent that refers to a technique for modifying pure sapphire so it’s more resistant to chipping, which would explain the high flexibility of the screen.

But the iPhone 5 Touch ID home button is even harder: It doesn’t get scratched by garnet or by even harder emery sandpaper. Brownlee concludes that the iPhone 5’s home button is made of pure sapphire.

Watch the whole video for a good education on the Mohs Scale of mineral hardness and what it might mean for the iPhone 6 if this is indeed the device’s glass front.

Here are some more videos on the supposed sapphire screen on the iPhone 6.

The iPhone 6's 'Unbreakable' Sapphire Screen

More information:

Apple designs and markets consumer electronics, computer software, and personal computers. The company's best-known hardware products include the Macintosh line of computers, the iPod, the iPhone, and the iPad. Apple software includes:... read more »

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