39 minerals · Trigonal minerals
Variety
Agate SiO₂
Variety
Amethyst SiO₂
Variety
Citrine SiO₂
Variety
Jasper SiO₂
Variety
Rose Quartz SiO₂
Variety
Ruby Al₂O₃
Variety
Sapphire Al₂O₃
Variety
Smoky Quartz SiO₂
Group
Tourmaline (Na,Ca)(Mg,Fe,Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
Variety
Ametrine SiO₂
Antimony Sb
Arsenic As
Variety
Aventurine SiO₂
Bismuth Bi
Variety
Carnelian SiO₂
Chabazite-Ca Ca₂[Al₄Si₈O₂₄]·13H₂O
C
Chabazite-K (K₂NaCa₀.₅)[Al₄Si₈O₂₄]·11H₂O
C
Chabazite-Na (Na₃K)[Al₄Si₈O₂₄]·11H₂O
Variety
Chalcedony SiO₂
Rock
Chert SiO₂ (cryptocrystalline)
Variety
Chrysoprase SiO₂
Crichtonite Sr(Mn,Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH)₃₈
Davidite-(La) La(Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH,F)₃₈
Delafossite Cu¹⁺Fe³⁺O₂
Rock
Flint SiO₂ (cryptocrystalline)
Heazlewoodite Ni₃S₂
Variety
Heliotrope SiO₂
K
Kapustinite Na₆ZrSi₆O₁₆(OH)₂
Lueshite NaNbO₃
Variety
Milky Quartz SiO₂
Variety
Moss Agate SiO₂
Variety
Onyx SiO₂
Variety
Prasiolite SiO₂
Rock
Quartzite SiO₂ (metamorphic rock)
Variety
Sard SiO₂
Variety
Sardonyx SiO₂
Svanbergite SrAl₃(SO₄)(PO₄)(OH)₆
Variety
Tiger's Eye SiO₂
Woodhouseite CaAl₃(SO₄)(PO₄)(OH)₆