Inner Senshi: Sailor Mercury, Mars, Jupiter, and Venus
Outer Senshi: Sailor Uranus, Neptune, Pluto, and Saturn
Who are you?
Usagi's friend and classmate
School nerd and Usagi's classmate
Works at Crown Arcade
Rainbow crystal carrier and Ami's crush
Works at Rei's grandfather's temple
Motoki's girlfriend and rainbow crystal carrier
Makoto's best friend
Chibi-Usa's purple-haired classmate
Motoki's sister and works at Crown Parlor
Naoko Takeuchi graduated from Kyoritsu Chemical University and was planning to become a pharmacist before her manga shot her into stardom. She shows her love of chemistry and jewelry in her villians. This connection only applies to characters that were in Naoko Takeuchi's original manga. Villians like Ail, Ann, and movie villians were all created and this connection does not apply to them.
In this list, I will only list a villian's name if the Japanese and English names are different or if a mineral or gem is related to his name.
You may notice that the Amazoness Quartet did not have mineral-related names like the rest of the villians. This is because, in the manga, the Amazoness Quartet would later become Sailor Chibi Moon's guardians, the Asteroid Sailor Senshi. Each one of them is named after an real asteroids that has been discovered and named in the Asteroid Belt between Mars and Jupiter in our Solar System.
1 It is rumored that Kunzite's name was changed in the English dub was because of a copyright issue. Kunzite is actually named after that geologist who discovered it, George Kunz. At least, DiC (the company who dubbed the English version) chose a nice, mineral-related name to replace Kunzite. 2 Cooan is the Japanese word for "kermesite". 3 Tiger's eye and hawk's eye are types of shiny quartz that makes it look like an eye. A more popular "eye" stone is cat's eye and the last of the four "eye" stones is bull's eye. 4 Fish eye is not a real "eye" stone. It's speculated that Fish Eye was not named after a real "eye" stone because he is "special". However, apophyllite is also known as fish eye.