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Tetragonal crystal system
372 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Kirchhoffite | CsBSi₂O₆ | — | 3.46 g/cm³ |
| Kojonenite | Pd₇₋ₓSnTe₂ (0.3≤x≤0.8) | — | — |
| Koninckite | Fe³⁺PO₄ * 3H₂O | — | — |
| Kopernikite | K(Ti₇Cr³⁺)O₁₆ | — | — |
| Kruijenite | Ca₄Al₄(SO₄)F₂(OH)₁₆*₂H₂O | 3.0 | — |
| Kusachiite | Cu²⁺Bi³⁺₂O₄ | — | — |
| Kuzminite | HgBr | 1.5 | — |
| Kësterite | Cu₂ZnSnS₄ | 4.5 | 4.61 g/cm³ |
| Laforêtite | — | — | 4.93 g/cm³ |
| Lannonite | Mg₂Ca₄Al₄(SO₄)₈F₈·24H₂O | — | — |
| Leadamalgam | Pb₀.₇Hg₀.₃ | — | — |
| Lebedevite | K₄Na₁₄Cu₁₄O₈(AsO₄)₈Cl₆ | — | — |
| Lemanskiite | NaCaCu₅(AsO₄)₄Cl * 3H₂O | — | — |
| Lenaite | AgFeS₂ | — | — |
| Leucite | K(AlSi₂O₆) | — | — |
| Liebermannite | KAlSi₃O₈ | — | 2.46 g/cm³ |
| Lingunite | NaAlSi₃O₈ | — | 2.64 g/cm³ |
| Linzhiite | FeSi₂ | — | 5.08 g/cm³ |
| Litharge | PbO | — | 8.81 g/cm³ |
| Lukkulaisvaaraite | Pd₁₄Ag₂Te₉ | — | — |
| Luzonite | Cu₃AsS₄ | 3.5 | — |
| Macedonite | PbTiO₃ | 5.5 | 7.80 g/cm³ |
| Mackinawite | (Fe,Ni)₉S₈ | 2.5 | 4.30 g/cm³ |
| Magnesiovesuvianite | Ca₁₉Mg(Al₁₀Mg₂)(Si₂O₇)₄(SiO₄)₁₀(OH)₁₀ | — | — |
| Mahnertite | NaCu₃(AsO₄)₂Cl * 5H₂O | — | — |
| Manaevite-(Ce) | Ca₁₁(Ce,H₂O,Ca)₈Mg(Al,Fe)₄(Mg,Ti,Fe³⁺)₈[Si₂O₇]₄[(SiO₄)₈(H₄O₄)₂](OH)₉ | — | — |
| Manganoquadratite | AgMnAsS₃ | — | — |
| Manganoschafarzikite | MnSb₂O₄ | — | 5.31 g/cm³ |
| Manganvesuvianite | Ca₁₉Mn³⁺(Al,Mn³⁺,Fe³⁺)₁₀(Mg,Mn²⁺)₂(Si₂O₇)₄(SiO₄)₁₀O(OH)₉ | — | 3.40 g/cm³ |
| Marialite | Na₄Al₃Si₉O₂₄Cl | — | — |
| Mathesiusite | K₅(UO₂)₄(SO₄)₄(VO₅)(H₂O)₄ | 2.0 | — |
| Matlockite | PbClF | — | — |
| Maucherite | Ni₁₁As₈ | 5.0 | — |
| Mawsonite | Cu₆Fe₂SnS₈ | — | — |
| Melanophlogite | ₄₆SiO₂ * 6(N₂,CO₂) * 2(CH₄,N₂) | — | — |
| Meliphanite | (Ca,Na)₂(Be,Al)[Si₂O₆(OH,F)] | — | — |
| Mellite | Al₂[C₆(COO)₆] * 16H₂O | — | — |
| Meta-autunite | Ca(UO₂)₂(PO₄)₂·6H₂O | — | — |
| Metatorbernite | Cu(UO₂)₂(PO₄)₂·8H₂O | — | — |
| Metazeunerite | Cu(UO₂)₂(AsO₄)₂·8H₂O | — | — |
| Minium | Pb²⁺₂Pb⁴⁺O₄ | — | — |
| Miyawakiite-(Y) | ◻Y₄Fe₂(Si₈O₂₀)(CO₃)·4(H₂O)₃ | — | — |
| Modraite | Ca₁₉Fe²⁺(Al₁₁Fe²⁺)(SiO₄)₁₀(Si₂O₇)₄O(OH)₉ | — | — |
| Mongolite | Ca₄Nb₆Si₅O₂₄(OH)₁₀·6H₂O | — | — |
| Mooihoekite | Cu₉Fe₉S₁₆ | 4.0 | 4.36 g/cm³ |
| Moschelite | HgI | — | 7.19 g/cm³ |
| Muirite | Ba₁₀Ca₂Mn²⁺Ti[HSi₂O₇]₅(OH,Cl,F)₅ | — | — |
| Murunskite | K₂(Cu,Fe)₄S₄ | — | — |
| Nabokoite | KCu₇(SO₄)₅(Te₄+O₃)OCl | — | — |
| Nancyrossite | FeGeO₆H₅ | — | — |
| Narsarsukite | Na₂(Ti,Fe³⁺)Si₄(O,F)₁₁ | — | — |
| Natisite | Na₂Ti(SiO₄)O | — | 3.17 g/cm³ |
| Nazarovite | — | — | — |
| Nefedovite | Na₅Ca₄(PO₄)₄F | — | — |
| Neltnerite | CaMn³⁺₆(SiO₄)O₈ | 6.0 | — |
| Niasite | — | — | — |
| Nickelphosphide | (Ni,Fe)₃P | — | — |
| Niobobaotite | — | — | — |
| Niveolanite | NaBe(CO₃)(OH)·2H₂O | — | — |
| Novodneprite | AuPb₃ | — | — |
| Nuwaite | Ni₆GeS₂ | — | — |
| Okayamalite | Ca₂B(BSiO₇) | — | — |
| Ordoñezite | ZnSb⁵⁺₂O₆ | — | — |
| Oulankaite | (Pd,Pt)₅(Cu,Fe)₄SnTe₂S₂ | — | — |
| Paceite | CaCu(CH₃COO)₂·6H₂O | 1.5 | — |
| Palladinite | PdO | — | 8.12 g/cm³ |
| Palladothallite | — | — | — |
| Panskyite | — | — | — |
| Paramelaconite | Cu¹⁺₂Cu²⁺₂O₃ | 4.5 | 6.04 g/cm³ |
| Paramontroseite | VO₂ | — | — |
| Paranatisite | Na₂Ti(SiO₄)O | — | 3.17 g/cm³ |
| Paraniite-(Y) | Ca₂Y(AsO₄)(WO₄)₂ | — | 5.69 g/cm³ |
| Paratellurite | TeO₂ | 1.0 | 5.60 g/cm³ |
| Percleveite-(Ce) | (Ce,La,Nd)₂Si₂O₇ | — | — |
| Percleveite-(La) | — | — | — |
| Permingeatite | Cu₃SbSe₄ | — | — |
| Petfordite | ZrW⁶⁺₂O₇(OH)₂(H₂O)₂ | — | — |
| Philolithite | Pb₁₂Mn²⁺(Mg,Mn²⁺)₂(Mn²⁺,Mg)₄(CO₃)₄(SO₄)O₆(OH)₁₂Cl₄ | — | — |
| Phosgenite | Pb₂CO₃Cl₂ | — | — |
| Pinnoite | MgB₂O(OH)₆ | — | — |