Philosopher's Stone unlock in pottermore chapter 17

how to find Philosopher's Stone and then unlock chapter 17 , there is  J.K. Rowling's thoughts about philisoper's stone too, find the answer at the end of this article

J.K. Rowling's thoughts about philosopher's stone
I did not invent the concept of the Philosopher's Stone, which is a legendary substance that was once believed to be real, and the true goal of alchemy.

The properties of 'my' Philosopher's Stone conform to most of the attributes the ancients ascribed to it. The Stone was believed to turn base metals into gold, and also to produce the Elixir of Life, which could make you immortal. 'Genuine' alchemists - the forerunners of chemists and physicists - such as Sir Isaac Newton and (the real) Nicolas Flamel, sought, sometimes over lifetimes, to discover the secret of its creation.

unlock philosophers stone pottermore
(tag : find Philosopher's Stone to unclock chapter 17  pottermore )
The Stone is variously described as red and white in the many old texts in which it appears. These colours are important in most accounts of alchemy, and are often interpreted as having symbolic meaning.
So what is the answer?
You have seen the picture above, yes it is in the left hand, just move your mouse over it and then....
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