The most common mineral on Earth was not seen by a single person until its discovery in 2014. Despite sounding like an impossibility, the mineral which comprised 38% of our planet's volume truly was not discovered until that year. Known as bridgmanite, this silicate mineral exists deep in our planet's lower mantle below 660 kilometers depth.

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Sources/Citations:
[1] Mindat, https://www.mindat.org/
[2] Mindat, Bridgmanite, https://www.mindat.org/min-45900.html
[3] Mindat, The Most Common Minerals on the Earth, By Jolyon Ralph, https://www.mindat.org/a/common_minerals
Bridgmanite

0:00 Minerals & Elements
0:39 Bridgmanite
0:56 Lower Mantle
1:33 San Carlos
2:23 Olivine Transition
3:12 Asteroids & Chondrites