Nature often shows us how the laws of physics and mathematics work through geometric shapes. Sometimes we think such forms cannot exist in nature since they seem too perfect and ideal.
This stone was considered sacred by members of the most mysterious medieval order - the Knights Templar. It comes as no surprise since the rock may change its colour in a matter of a few minutes.
When exposed to air, this stone turns dark; neither it is resistant to moisture attack. Both the downsides did not, however, stop the mineral from turning into a sought-after analogue of diamonds.
Until the early 19th century, this stone was often mistaken for emerald. But when the truth had been revealed, people’s interest in the mineral only started to increase, for the rock turned out to be no less rare and highly-demanded.
The predatory appearance of this stone seems to warn of the danger hidden inside it. However, more than one hundred people were destined to die before the secret of the mineral was revealed.