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Monoclinic crystal system
1,774 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Rakovanite | Na₃{H₃[V₁₀O₂₈]}·15H₂O | — | — |
| Ramanite-(Cs) | CsB₅O₆(OH)₄·2H₂O | — | — |
| Ramdohrite | Pb₅.₉Fe₀.₁Mn₀.₁In₀.₁Cd₀.₂Ag₂.₈Sb₁₀.₈S₂₄ | 2.0 | — |
| Rameauite | K₂Ca(H[₃]₂O)(H[₅]₂O)₄[(UO₂)₆O₆(OH)₄](H[₄]₂O) | — | — |
| Ramosite | — | — | — |
| Ramsbeckite | (Cu,Zn)₁₅(SO₄)₄(OH)₂₂·6H₂O | 3.5 | — |
| Rankachite | Ca₀.₅(V₄+,V₅+)(W₆+,Fe³⁺)₂O₈(OH) * 2H₂O | — | — |
| Rankinite | Ca₃Si₂O₇ | — | — |
| Ransomite | CuFe₂(SO₄)₄ * 6H₂O | — | — |
| Rathite-IV | Pb₃As₅S₁₀ | — | — |
| Ravatite | C₁₄H₁₀ | 1.0 | 1.11 g/cm³ |
| Realgar | AsS | — | 3.26 g/cm³ |
| Reckibachite | Ag₂Pb₁₂As₁₄Sb₄S₄₀ | — | — |
| Redcanyonite | (NH₄)₂Mn[(UO₂)₄O₄(SO₄)₂](H₂O)₄ | — | — |
| Redgillite | Cu₆(SO₄)(OH)₁₀·H₂O | — | — |
| Redingtonite | (Fe²⁺,Mg,Ni)(Cr,Al)₂(SO₄)₄*₂₂H₂O | — | — |
| Redmondite | — | — | — |
| Regerite | KFe₆(PO₄)₄(OH)₇(H₂O)₆·4H₂O | — | — |
| Reichenbachite | Cu₅(PO₄)₂(OH)₄ | 3.5 | 4.37 g/cm³ |
| Reinhardbraunsite | Ca₅(SiO₄)₂(OH,F)₂ | — | — |
| Relianceite-(K) | — | — | — |
| Rengeite | Sr₄Ti₄ZrO₈(Si₂O₇)₂ | — | — |
| Rewitzerite | [K(H₂O)]Mn₂(Al₂Ti)(PO₄)₄[O(OH)](H₂O)₁₀·4H₂O | — | — |
| Reznitskyite | — | — | — |
| Richardsollyite | TlPbAsS₃ | — | — |
| Richelsdorfite | Ca₂Cu₅Sb(AsO₄)₄(OH)₆Cl * 6H₂O | — | — |
| Richterite | Na(NaCa)Mg₅Si₈O₂₂(OH)₂ | — | — |
| Riebeckite | ☐Na₂(Fe²⁺₃Fe³⁺₂)Si₂O₂₂(OH)₂ | 6.0 | — |
| Riesite | TiTiO₄ | — | — |
| Rigrahamite | Na₂Ca₂Th₂(CO₃)₄(HCO₃)₂(OH)₄(H₂O)₇ | — | — |
| Rinkite-(Ce) | (Ca₃REE)Na(NaCa)Ti(Si₂O₇)₂(OF)F₂ | — | — |
| Rinkite-(Y) | Na₂Ca₄YTi(Si₂O₇)₂OF₃ | — | — |
| Riomarinaite | Bi(SO₄)(OH) * H₂O | — | — |
| Rittmannite | (Mn²⁺,Ca)Mn²⁺(Fe²⁺,Mn²⁺,Mg)₂(Al,Fe³⁺)₂(PO₄)₄(OH)₂(H₂O)₈ | — | — |
| Rivadavite | Na₆Mg[B₆O₇(OH)₆]₄ * 10H₂O | — | — |
| Robertsite | Ca₂Mn³⁺₃(PO₄)₃O₂(H₂O)₂·H₂O | — | — |
| Robinsonite | Pb₄Sb₆S₁₃ | — | — |
| Roeblingite | Ca₆Mn²⁺Pb₂(Si₃O₉)₂(SO₄)₂(OH)₂·4H₂O | — | — |
| Rokühnite | — | — | — |
| Romanèchite | (Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀ | — | — |
| Rongibbsite | Pb₂(Si₄Al)O₁₁(OH) | — | — |
| Ronneburgite | K₂MnV₄O₁₂ | 3.0 | 2.66 g/cm³ |
| Rosasite | CuZnCO₃(OH)₂ | 4.5 | — |
| Roscoelite | K(V³⁺,Al)₂(AlSi₃O₁₀)(OH)₂ | 2.5 | — |
| Roselite | Ca₂Co(AsO₄)₂·2H₂O | 3.5 | — |
| Rosemaryite | (Na,Ca,Mn)(Mn,Fe²⁺)(Fe³⁺,Mg)Al(PO₄)₃ | — | — |
| Rosickýite | S | — | — |
| Rossovskyite | (Fe³⁺,Ta)(Nb,Ti)O₄ | — | — |
| Rotherkopfite | KNa₂Fe²⁺(Fe²⁺)₂(Ti₁.₅Fe²⁺₀.₅)[Si₄O₁₂]₂ | — | — |
| Rouaite | Cu₂(NO₃)(OH)₃ | — | — |
| Roumaite | (Nb,Ti)(Ca,Na,☐)₃(Ca,REE)₄(Si₂O₇)₂(OH)F₃ | — | — |
| Rouvilleite | Na₃Ca₂(CO₃)₃F | — | — |
| Rozenite | FeSO₄ * 4H₂O | — | — |
| Rruffite | Ca₂Cu(AsO₄)₂·2H₂O | — | — |
| Ruarsite | (Ru,Os)AsS | — | — |
| Rudenkoite | Sr₃(Al₃.₅Si₃.₅)O₁₀(OH,O)₈Cl₂ * H₂O | — | — |
| Ruitenbergite | Ca₉B₂₆O₃₄(OH)₂₄Cl₄ * 13H₂O | — | — |
| Ruizite | Ca₂Mn³⁺₂[Si₄O₁₁(OH)₂](OH)₂*₂H₂O | — | — |
| Rundqvistite-(Ce) | Na₃(Sr₃Ce)[Zn₂Si₈O₂₄] | — | — |
| Rustumite | Ca₁₀(Si₂O₇)₂(SiO₄)(OH)₂Cl₂ | — | — |
| Rémondite-(Ce) | Na₃(Ce,Ca,Na)₃(CO₃)₅ | — | — |
| Rémondite-(La) | Na₃(La,Ca,Na)₃(CO₃)₅ | — | — |
| Rüdlingerite | — | — | — |
| Sabinaite | Na₄Zr₂TiO₄(CO₃)₄ | — | 3.30 g/cm³ |
| Sabugalite | HAl(UO₂)₄(PO₄)₄·16H₂O | 2.5 | — |
| Sadanagaite | {Na}{Ca₂}{Mg₃Al₂}(Si₅Al₃O₂₂)(OH)₂ | — | — |
| Sahamalite-(Ce) | Ce₂Mg(CO₃)₄ | — | — |
| Sahlinite | Pb₁₄(AsO₄)₂O₉Cl₄ | — | — |
| Sakhanaiskite | (Fe²⁺Ti)Nb₂O₈ | — | — |
| Saléeite | Mg(UO₂)₂(PO₄)₂·10H₂O | — | — |
| Samarskite-(Yb) | YbNbO₄ | — | 7.68 g/cm³ |
| Samfowlerite | Ca₂₈Mn₆Zn₄(Be,Zn)₄Be₁₂[(OH)₃|(SiO₄)₃|(Si₂O₇)₂]₄ | — | — |
| Samraite | Ni₂P₂O₇ | — | 4.28 g/cm³ |
| Samsonite | Ag₄MnSb₂S₆ | — | — |
| Sangenaroite | — | — | — |
| Sanguite | KCuCl₃ | — | 2.87 g/cm³ |
| Sanidine | KAlSi₃O₈ | 6.0 | 2.46 g/cm³ |
| Sanmartinite | ZnWO₄ | 5.0 | — |
| Saponite | Ca₀.₂₅(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ * nH₂O | — | — |
| Sapphirine | Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆] | 7.5 | — |