The latest study focused on a lava tube named Umm Jirsan, which is in the volcanic field of Harrat Khaybar in Saudi Arabia, around 125 kilometres north of Medina, the country’s fourth biggest ...

"The step is a qualitative leap in the exploration and documentation of Saudi Arabia's geological and natural heritage".

(2) Peridot from Harrat Kishb (volcanic field), Saudi Arabia. (3a) Emerald and (3b) Amazonite, Wadi Sikait, Wadi El-Gemal area, Eastern Desert, Egypt. (4) Low-grade emerald (beryl), Wadi Ghazala ...