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 TRSE Museum:
  Minerals Which the Villians are Named After
Dedicated to the villains of Sailor Moon R.
Coin is for scale.
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Prince Demand
(P. Diamond)
Diamond
South Africa
Saphir ("Safir")
( Sapphire)
Sapphire, blue
Africa
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Esmeraude
( Emerald)
Emerald on Quartz
Columbia, South America.
Rubeus
Ruby
Burma, Asia
.Note: The light from my scanner caused the ruby to fluoresce.
The ruby 's true color is more purplish..
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Petz 
(Prizma)
Petzite (gold alloy ore)
Calaveras (Avery)  Calavasite (gold alloy ore)
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Berthier ("Beruche") (Bertie)
 Berthierite
Koan/Kôan  (Cooan)(Catz) Kôan 
Japanese name for Kermesite
Thanks to Celexa for the pics of Black Moon Sisters!

Sources:
My own comparisons of the names of villains and minerals.
Mineralogy Database
Dies Guadas
Sailor Moon RPG & Resources Book Published by Guardians of Order

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