R
Ralstonite
Ramsbeckite
Ramsdellite
Rankachite
Rathite
Realgar
Rhabdophane
Rhodochrosite
Rhodonite
Rhönite
Riebeckite (Amphibole Supergroup)
Ripidolite
Robertsite
Rockbridgeite
Roedderite
Rosasite
Roselite
Rubellane
Rubellite (Tourmaline Group)
Rutile