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- Orthorhombic
Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Montesommaite | K₉(Si₂₃Al₉)O₆₄·10H₂O | — | — |
| Montetrisaite | Cu₆(SO₄)(OH)₁₀·2H₂O | — | — |
| Monticellite | CaMgSiO₄ | — | 2.96 g/cm³ |
| Moolooite | Cu(C₂O₄)·nH₂O | — | — |
| Moraskoite | Na₂Mg(PO₄)F | — | 2.98 g/cm³ |
| Mordenite | (Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆·28H₂O | — | — |
| Morenosite | NiSO₄·7H₂O | — | — |
| Moskvinite-(Y) | Na₂KYSi₆O₁₅ | — | 2.75 g/cm³ |
| Mottramite | PbCuVO₄(OH) | — | — |
| Moydite-(Y) | Y[B(OH)₄](CO₃) | — | — |
| Mroseite | CaTe₄+(CO₃)O₂ | — | — |
| Mullite | 3Al₂O₃·2SiO₂ | — | — |
| Mundite | Al(UO₂)₃(PO₄)₂(OH)₃ * 5.₅H₂O | — | — |
| Murashkoite | FeP | — | 6.37 g/cm³ |
| Murphyite | Pb(Te⁶⁺O₄) | — | — |
| Mutinaite | Na₃Ca₄Si₈₅Al₁₁O₁₉₂ * 6₀H₂O | — | — |
| Mutnovskite | Pb₂AsS₃(I,Cl,Br) | 2.0 | — |
| Mélonjosephite | — | — | — |
| Mückeite | CuNiBiS₃ | — | — |
| Nabesite | Na₂BeSi₄O₁₀ * 4H₂O | — | — |
| Nadorite | PbSb³⁺O₂Cl | — | — |
| Nakauriite | Cu₈(SO₄)₄(CO₃)(OH)₆ * 4₈H₂O | — | — |
| Nakkaalaaqite | — | — | — |
| Naldrettite | Pd₂Sb | — | 10.52 g/cm³ |
| Nalipoite | NaLi₂PO₄ | — | 2.49 g/cm³ |
| Napoliite | Pb₂OFCl | — | — |
| Nasinite | Na₂[B₅O₈(OH)] * 2H₂O | — | — |
| Nataliakulikite | Ca₄Ti₂(Fe³⁺,Fe²⁺)(Si,Fe³⁺,Al)O₁₁ | — | — |
| Nataliyamalikite | TlI | — | 6.30 g/cm³ |
| Natrolite | Na₂(Si₃Al₂)O₁₀·2H₂O | — | — |
| Natromarkeyite | Na₂Ca₈(UO₂)₄(CO₃)₁₃(H₂O)₂₄·3H₂O | — | — |
| Natromolybdite | Na₂MoO₄·2H₂O | — | — |
| Natropalermoite | Na₂SrAl₄(PO₄)₄(OH)₄ | — | — |
| Natrosulfatourea | — | — | — |
| Natrowalentaite | [Fe³⁺₀.₅Na₀.₅(H₂O)₆][NaAs³⁺₂(Fe³⁺₂.₃₃W₆+₀.₆₇)(PO₄)₂O₇] | — | — |
| Naumannite | Ag₂Se | 2.5 | — |
| Navrotskyite | K₂Na₁₀(UO₂)₃(SO₄)₉·2H₂O | — | — |
| Nazarchukite | Ca₂NiFe³⁺₂(PO₄)₄ | — | — |
| Nchwaningite | Mn₂SiO₃(OH)₂·H₂O | — | — |
| Neighborite | NaMgF₃ | 4.5 | 3.15 g/cm³ |
| Nenadkevichite | (Na,☐)₈Nb₄(Si₄O₁₂)₂(O,OH)₄·8H₂O | — | — |
| Nepskoeite | Mg₄Cl(OH)₇ * 6H₂O | — | — |
| Newberyite | Mg(PO₃OH)·3H₂O | — | — |
| Nickelaustinite | CaNi(AsO₄)(OH) | — | 4.16 g/cm³ |
| Nickolayite | FeMoP | — | 8.51 g/cm³ |
| Nielsbohrite | (K,U,☐)(UO₂)₃(AsO₄)(OH)₄·H₂O | — | — |
| Nioboaeschynite-(Ce) | (Ce,Ca)(Nb,Ti)₂(O,OH)₆ | — | — |
| Nioboaeschynite-(Y) | (Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)₂(O,OH)₆ | — | — |
| Nioboholtite | (Nb₀.₆☐₀.₄)Al₆BSi₃O₁₈ | — | — |
| Nioboixiolite-(Fe²⁺) | Nb₂Fe²⁺O₆ | — | — |
| Nioboixiolite-(Fe³⁺) | — | — | — |
| Nioboixiolite-(◻) | (Nb₀,₈☐₀,₂)⁴⁺O₂ | — | — |
| Nisbite | NiSb₂ | — | 7.93 g/cm³ |
| Nishanbaevite | KAl₂O(AsO₄)(SO₄) | — | — |
| Nitre | KNO₃ | — | 2.19 g/cm³ |
| Nizamoffite | Mn²⁺Zn₂(PO₄)₂(H₂O)₄ | — | — |
| Noelbensonite | BaMn³⁺₂(Si₂O₇)(OH)₂·(H₂O) | — | — |
| Noonkanbahite | NaKBaTi₂(Si₄O₁₂)O₂ | — | — |
| Norbergite | Mg₃SiO₄F₂ | — | 3.08 g/cm³ |
| Nyerereite | Na₂Ca(CO₃)₂ | 2.5 | — |
| Népouite | Ni₃Si₂O₅(OH)₄ | 2.5 | — |
| Nöggerathite-(Ce) | — | — | — |
| Obradovicite-KCu | [K₂(H₂O)₁₇Cu(H₂O)₆][Mo₈As₂Fe³⁺₃O₃₄(OH)₃] | — | — |
| Obradovicite-NaCu | [Na₂(H₂O)₁₇Cu(H₂O)₆][Mo₈As₂Fe³⁺₃O₃₄(OH)₃] | — | — |
| Obradovicite-NaNa | [Na₂(H₂O)₁₆Na(H₂O)₆][Mo₈As₂Fe³⁺₃O₃₃(OH)₄] | — | — |
| Odintsovite | K₂Na₄Ca₃Ti₂Be₄Si₁₂O₃₈ | — | — |
| Oenite | CoSbAs | — | — |
| Ohtaniite | Mg₃(Si₀,₅◻₀,₅)Si₂O₈ | — | — |
| Oldsite-(K) | K₂Fe²⁺[(UO₂)(SO₄)₂]₂(H₂O)₈ | — | — |
| Olivenite | Cu₂(AsO₄)(OH) | 3.0 | — |
| Olmiite | CaMn[SiO₃(OH)](OH) | — | — |
| Olsacherite | Pb₂(SeO₄)(SO₄) | — | — |
| Olsenite | KFe₄(PO₄)₃ | — | — |
| Omariniite | Cu₈Fe₂ZnGe₂S₁₂ | — | — |
| Omeiite | (Os,Ru)As₂ | 7.0 | — |
| Ominelite | (Fe²⁺,Mg)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂ | — | — |
| Oosterboschite | (Pd,Cu)₇Se₅ | — | — |
| Orientite | Ca₈Mn³⁺₁₀(SiO₄)₃(Si₃O₁₀)₃(OH)₁₀·4H₂O | — | — |
| Orishchinite | Ni₂P | — | — |
| Orthobrannerite | U⁴⁺U⁶⁺Ti₄O₁₂(OH)₂ | — | — |