Located on the western edge of the Sahara desert at central Mauritania in northwest Africa, there is a giant circle called Richat Structure, whose diameter ranges as long as 38km. It is made of quartzite.
The Guinness Book of World Records names Painite as the rarest gem mineral on earth. Named after Arthur Pain, the gem’s English discoverer, Painite has so far only been found in Myanmar, Indonesia. Painite colours vary from pink to brown and like diamond Painite will appear a different colour when viewed from different angles. Very few Painite crystals are known to exist and even fewer have been cut into gemstones. As a result you can expect to pay around $ 1,800 per carat for Painite.
Translucent bright blue curved Chalcanthite crystals. Chalcanthite is water-soluble so this specimen was oiled sealed to prevent degradation. Source: Planet Mine, La Paz County, Arizona, United States of America.