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- Orthorhombic
Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Leonardsenite | MgAlF₅·2H₂O | — | — |
| Lepersonnite-(Gd) | CaGd₂(UO₂)₂₄(CO₃)₈Si₄O₂₈·60H₂O | — | — |
| Lepidocrocite | Fe³⁺O(OH) | 5.0 | — |
| Leucophanite | NaCaBeSi₂O₆F | — | 2.97 g/cm³ |
| Leucostaurite | Pb₂[B₅O₉]Cl·0.5H₂O | — | — |
| Libethenite | Cu₂PO₄(OH) | 4.0 | — |
| Liebenbergite | Ni₂SiO₄ | — | 4.95 g/cm³ |
| Liebigite | Ca₂(UO₂)(CO₃)₃·11H₂O | — | 2.41 g/cm³ |
| Likasite | Cu₃(NO₃)(OH)₅ * 2H₂O | — | — |
| Lindströmite | Pb₃Cu₃Bi₇S₁₅ | — | — |
| Lipuite | KNa₈Mn³⁺₅Mg₀.₅[Si₁₂O₃₀(OH)₄](PO₄)O₂(OH)₂·4H₂O | — | — |
| Liraite | — | — | — |
| Lisiguangite | CuPtBiS₃ | 2.5 | 7.74 g/cm³ |
| Lisitsynite | KBSi₂O₆ | — | 2.63 g/cm³ |
| Lithiophilite | LiMn²⁺(PO₄) | — | — |
| Lithiophosphate | Li₃PO₄ | — | — |
| Liuite | FeTiO₃ | — | — |
| Lokkaite-(Y) | CaY₄(CO₃)₇·9H₂O | — | — |
| Lorenzenite | Na₂Ti₂O₃(Si₂O₆) | 6.0 | 3.31 g/cm³ |
| Lovdarite | K₂Na₆Be₄Si₁₄O₃₆·9H₂O | — | — |
| Ludwigite | Mg₂Fe³⁺O₂(BO₃) | 5.5 | — |
| Lun'okite | — | — | — |
| Luobusaite | Fe₀.₈₄Si₂ | — | — |
| Luogufengite | — | — | — |
| Luoxianchangite | Ag₈SnS₄Se₂ | — | — |
| Lusernaite-(Y) | Y₄Al(CO₃)₂(OH,F)₁₁·6H₂O | — | — |
| Lyonsite | — | — | — |
| Línekite | K₂Ca₃[(UO₂)(CO₃)₃]₂·7H₂O | — | — |
| Löllingite | FeAs₂ | — | 7.60 g/cm³ |
| Macdonaldite | BaCa₄Si₁₆O₃₆(OH)₂·10H₂O | — | — |
| Macphersonite | Pb₄(CO₃)₂(SO₄)(OH)₂ | — | — |
| Madocite | Pb₁₈(Sb,As)₁₅S₄₁ | — | — |
| Magbasite | KBaFe³⁺Mg₇Si₈O₂₂(OH)₂F₆ | — | — |
| Maleevite | BaB₂Si₂O₈ | — | 3.62 g/cm³ |
| Malyshevite | PdCuBiS₃ | — | — |
| Manandonite | Li₂Al₄(Si₂AlB)O₁₀(OH)₈ | 2.5 | — |
| Maneckiite | (Na☐)Ca₂Fe²⁺₂(Fe³⁺Mg)Mn₂(PO₄)₆·2H₂O | — | — |
| Manganonewberyite | Mn(PO₃OH)(H₂O)₃ | — | — |
| Manganostibite | Mn²⁺₇Sb⁵⁺As⁵⁺O₁₂ | — | — |
| Mantienneite | (H₂O)₂Mg₂(Al₂Ti)(PO₄)₄(OH)₂(H₂O)₁₀·4H₂O | — | — |
| Maohokite | MgFe₂O₄ | — | 4.42 g/cm³ |
| Marcasite | FeS₂ | — | 4.94 g/cm³ |
| Maricopaite | Ca₂Pb₇(Si₃₆Al₁₂)O₉₉·n(H₂O,OH) | — | — |
| Mariinskite | BeCr₂O₄ | 8.5 | 4.62 g/cm³ |
| Marićite | — | — | — |
| Markeyite | Ca₉(UO₂)₄(CO₃)₁₃·28H₂O | — | — |
| Marokite | CaMn³⁺₂O₄ | — | — |
| Martinandresite | Ba₂(Al₄Si₁₂O₃₂)·10H₂O | — | — |
| Masaitisite | KCu₅O₂(SeO₃)₂Cl₃ | — | — |
| Mascagnite | (NH₄)₂SO₄ | — | — |
| Massicot | PbO | — | 8.81 g/cm³ |
| Masuyite | Pb(UO₂)₃O₃(OH)₂ * 3H₂O | — | 5.08 g/cm³ |
| Mattagamite | CoTe₂ | — | 7.79 g/cm³ |
| Mckinstryite | Ag₅Cu₃S₄ | — | — |
| Megawite | CaSnO₃ | — | 5.52 g/cm³ |
| Meieranite | Na₂Sr₃MgSi₆O₁₇ | — | — |
| Mejillonesite | HNaMg₂(HPO₄)(PO₄)(OH)·2H₂O | 4.0 | — |
| Melanotekite | Pb₂Fe³⁺₂(Si₂O₇)O₂ | — | — |
| Melanothallite | Cu₂OCl₂ | — | — |
| Melansonite | — | — | — |
| Mendipite | Pb₃O₂Cl₂ | — | — |
| Meneghinite | Pb₁₃CuSb₇S₂₄ | 2.5 | — |
| Mengxianminite | (Ca,Na)₂Sn₂(Mg,Fe)₃Al₈[(BO₃)(BeO₄)O₆]₂ | — | — |
| Mercallite | KHSO₄ | — | 2.37 g/cm³ |
| Merlinoite | K₅Ca₂(Si₂₃Al₉)O₆₄·24H₂O | 4.5 | — |
| Mesolite | Na₂Ca₂(Si₉Al₆)O₃₀·8H₂O | 5.0 | — |
| Meta-alunogen | Al₂(SO₄)₃·14H₂O | — | — |
| Metamunirite | NaVO₃ | — | 2.93 g/cm³ |
| Metasideronatrite | Na₂Fe(SO₄)₂(OH) * H₂O | — | — |
| Metauranopilite | (UO₂)₆(SO₄)(OH)₁₀ * 5H₂O | — | — |
| Metazellerite | Ca(UO₂)(CO₃)₂ * 3H₂O | — | — |
| Michalskiite | — | — | — |
| Mieite-(Y) | Y₄Ti(SiO₄)₂O[F,(OH)]₆ | — | — |
| Miharaite | PbCu₄FeBiS₆ | — | — |
| Minakawaite | RhSb | — | 10.04 g/cm³ |
| Minyulite | KAl₂(PO₄)₂F·4H₂O | 3.5 | — |
| Moabite | NiFe³⁺(PO₄)O | — | — |
| Modderite | (Co,Fe)As | 4.0 | — |
| Molybdite | MoO₃ | — | — |
| Monchetundraite | — | — | — |