There are over 4,000 types of known minerals.

It is the softest known mineral and listed as 1 on the Mohs hardness scale.

It forms under acidic to neutral pH and is the only known mineral that contains only uranyl and carbonate.

No known minerals show such a feature, and it is found nowhere else in the solar system.

The oldest known minerals are from the Cryptic era.

Rutile has among the highest refractive indices of any known mineral and also exhibits high dispersion.

The c-axis is the longest of any known mineral.

It did not conform to any known mineral at the time, a fact confirmed when it was studied at a local mineralogical institute.

Zirconium is one of the main components of zircon crystals, currently the oldest known minerals in the earth's crust.

The specimen was sent to E. Linares who determined it to be unlike any known mineral.