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Tetragonal crystal system
372 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Cyprine | Ca₁₉Cu²⁺(Al₁₀Mg₂)Si₁₈O₆₈(OH)₁₀ | — | — |
| Cyrilovite | NaFe³⁺₃(PO₄)₂(OH)₄ * 2H₂O | — | — |
| Deltalumite | (Al₀.₆₇☐₀.₃₃)Al₂O₄ | — | — |
| Diaboleite | CuPb₂Cl₂(OH)₄ | 2.5 | — |
| Downeyite | SeO₂ | — | 4.14 g/cm³ |
| Effenbergerite | BaCuSi₄O₁₀ | — | — |
| Ekanite | Ca₂ThSi₈O₂₀ | — | — |
| Eskebornite | CuFeSe₂ | — | — |
| Ewingite | Mg₈Ca₈(UO₂)₂₄(CO₃)₃₀O₄(OH)₁₂(H₂O)₁₃₈ | — | — |
| Famatinite | Cu₃SbS₄ | 3.5 | 4.73 g/cm³ |
| Favreauite | PbBiCu₆O₄(SeO₃)₄(OH)·H₂O | — | — |
| Fergusonite-(Ce) | (Ce,La,Nd)NbO₄ | — | — |
| Fergusonite-(Nd) | (Nd,Ce)(Nb,Ti)O₄ | — | — |
| Fergusonite-(Y) | YNbO₄ | — | 5.47 g/cm³ |
| Ferhodsite | (Fe,Rh,Ni,Ir,Cu,Pt)₉S₈ | — | — |
| Ferricoronadite | Pb(Mn₄+₆Fe³⁺₂)O₁₆ | — | — |
| Ferrimuirite | Ba₁₀(Ca₂Fe³⁺₂)[Si₈O₂₄]O₂Cl₁₀ | — | — |
| Ferrokësterite | Cu₂FeSnS₄ | 4.0 | — |
| Ferronickelplatinum | (Ni,Fe)Pt | — | — |
| Ferrostalderite | CuFe₂TlAs₂S₆ | — | — |
| Ferroåkermanite | Ca₂FeSi₂O₇ | — | — |
| Fluorapophyllite-(Cs) | — | — | — |
| Fluorapophyllite-(K) | KCa₄(Si₈O₂₀)F(H₂O)₈ | — | — |
| Fluorapophyllite-(NH₄) | — | — | — |
| Fluorcarletonite | — | — | — |
| Fluorowardite | NaAl₃(PO₄)₂(OH)₂F₂·2H₂O | — | — |
| Fluorvesuvianite | Ca₁₉(Al,Mg,Fe²⁺)₁₃(Si₂O₇)₄(SiO₄)₁₀O(F,OH)₉ | 6.0 | 3.43 g/cm³ |
| Formanite-(Y) | YTaO₄ | — | 7.52 g/cm³ |
| Formicaite | Ca(CHOO)₂ | 1.0 | — |
| Fresnoite | Ba₂Ti(Si₂O₇)O | — | 4.38 g/cm³ |
| Fritzscheite | Mn²⁺(UO₂)₂(PO₄,VO₄)₂·10H₂O | — | 3.50 g/cm³ |
| Fullerite | — | — | — |
| Gallite | CuGaS₂ | — | 4.41 g/cm³ |
| Garronite-Ca | Ca₃(Al₆Si₁₀O₃₂)·14H₂O | — | — |
| Gatedalite | ZrMn²⁺₂Mn³⁺₄O₈(SiO₄) | — | — |
| Gehlenite | Ca₂Al(SiAl)O₇ | — | — |
| Genkinite | Pt₄Sb₃ | — | — |
| Gonnardite | (Na,Ca)₂(Si,Al)₅O₁₀·3H₂O | 5.0 | — |
| Grahampearsonite | Ca₂P₂O₇ | — | 2.95 g/cm³ |
| Grechishchevite | — | — | — |
| Gugiaite | Ca₂Be(Si₂O₇) | — | — |
| Hafnon | HfSiO₄ | 7.5 | 7.02 g/cm³ |
| Hardystonite | Ca₂ZnSi₂O₇ | — | — |
| Hauchecornite | Ni₉BiSbS₈ | — | — |
| Hausmannite | Mn²⁺Mn³⁺₂O₄ | 5.5 | — |
| Henritermierite | Ca₃Mn³⁺₂(SiO₄)₂(OH)₄ | — | — |
| Henrymeyerite | — | — | — |
| Hetaerolite | ZnMn³⁺₂O₄ | 6.0 | — |
| Hocartite | Ag₂FeSnS₄ | 4.0 | — |
| Holtstamite | Ca₃(Al,Mn³⁺)₂(SiO₄)₂(OH)₄ | 6.0 | — |
| Hongheite | Ca₁₉Fe²⁺Al₄(Fe³⁺,Mg,Al)₈(☐,B)₄BSi₁₈O₆₉(O,OH)₉ | — | — |
| Horomanite | Fe₆Ni₃S₈ | — | — |
| Hydroromarchite | Sn²⁺₃O₂(OH)₂ | — | — |
| Hydroxyapophyllite-(NH₄) | (NH₄)Ca₄(Si₈O₂₀)(OH)(H₂O)₈ | — | — |
| Hydroxylgugiaite | (Ca,☐)₂(Si,Be)(Be,Si)₂O₅(OH)₂ | — | — |
| Hydroxymcglassonite-(K) | KSr₄Si₈O₂₀(OH)(H₂O)₈ | — | — |
| Igelströmite | Fe³⁺(SbPb)O₄ | — | — |
| Indium (native) | In | — | — |
| Iraqite-(La) | KCa₂(La,Ce,Th)Si₈O₂₀ | — | — |
| Itsiite | Ba₂Ca(BSi₂O₇)₂ | — | 3.51 g/cm³ |
| Jacobsite-Q | — | — | — |
| Jalpaite | Ag₃CuS₂ | — | — |
| Janchevite | Pb₇V₅+(O₈.₅☐₀.₅)Cl₂ | — | — |
| Jasmundite | Ca₁₁(SiO₄)₄O₂S | — | — |
| Jeanbandyite | Fe³⁺xFe²⁺₁-xSn(OH)₆-xOx | — | — |
| Jeffbenite | Mg₃Al₂Si₃O₁₂ | — | — |
| Jianmuite | ZrTi⁴⁺Ti³⁺₅Al₃O₁₆ | — | — |
| Jinxiuite | Ni₁₈Bi₂SbAsS₁₆ | — | — |
| Jordanówite | Zr(Ti³⁺Zr)Ti³⁺₄AlO₁₆ | — | — |
| Juanitaite | — | — | — |
| Kafehydrocyanite | — | — | 1.98 g/cm³ |
| Kalborsite | K₆Al₄BSi₆O₂₀(OH)₄Cl | — | — |
| Kalithallite | K₃Tl³⁺Cl₆*₂H₂O | — | — |
| Kamaishilite | Ca₂(Al₂SiO₆)(OH)₂ | — | — |
| Kamphaugite-(Y) | Ca(Y,REE)(CO₃)₂(OH) * H₂O | — | — |
| Karlleuite | Ca₂MnO₄ | — | — |
| Keatite | SiO₂ | — | 2.63 g/cm³ |
| Keutschite | Cu₂AgAsS₄ | — | — |
| Khatyrkite | (Cu,Zn)Al₂ | — | — |
| Kingsgateite | — | — | — |