Minerals: R

Ralstonite(Na,Mg,Al,F,OH,nH2O)
RammelsbergiteNiAs2
RamsdelliteMnO2
RealgarAsS
Red BerylBe3Al2(SiO3)6
RheniiteReS2
Rhodizite(K,Cs)Be4Al4(B,Be)12O28
RhodochrositeMnCO3
Rickardite(Cu,Te)
Rinneite(K,Na,Fe,Cl)
RoalditeFe4N
RobinsonitePb4Sb6S13
Rock CrystalSiO2
RomanechiteBa(Mn+2,Mn+4)5O10.H2
Romeite(Ca,Na,Fe,Mn,Sb,Ti,O,OH)
RontgeniteCa2(Ce,La)3(CO3)5F3
Rosasite(Cu,Zn)2(CO3)(OH)2
Rose QuartzSiO2
RubyAl2O3 + Cr trace
RutileTiO2