A 2012 study classified Mount Arafat as a
granodiorite rock which mainly consists of
feldspar,
quartz and
muscovite, among other minerals, using petrographic, fission track dating and γ-spectrometric (HPGe) techniques in order to study the geology, thermal history and the radiological hazards due to the presence of
primordial radionuclides. The study yielded fission track age of 9.13 ± 1.05 Ma of the Mount Arafat granodiorite. In addition, the study reported that rifting, magmatism, volcanism and seafloor spreading that resulted in the formation of
Red Sea seems to have altered the original age of the Arafat granodiorite under study to 9.13 ± 1.05 Ma. Measured radioactivity concentrations due to
Ra,
Th and
K were found to not pose any radiological health hazard to the general public. == Hajj ==