Which of the following mineral does not contain oxygen ?
Answer: (3). Cryolite
Cryolite is a mineral, it is also a combination of the aluminium oxide mineral and it is only mineral in which oxygen is not found. It was historically known as aluminium ore. It is also known as Sodium hexafluoroaluminate ( Na3Alf6 ). It a white colour mineral.
It is an uncommon mineral firstly identified as a large deposit at Livigtut on the west coast of greenland, depleted in 1987. Cryolite is used as Insecticides and Pesticide, it is also used in giving yellow in fireworks.