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Monoclinic crystal system
1,774 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Acanthite | Ag₂S | — | — |
| Achalaite | Fe²⁺TiNb₂O₈ | — | — |
| Actinolite | Ca₂(Mg,Fe)₅[OH|Si₄O₁₁]₂ | — | — |
| Acuminite | SrAlF₄(OH)·H₂O | 3.5 | — |
| Adanite | — | 2.5 | — |
| Admontite | MgB₆O₁₀·7H₂O | — | — |
| Adolfpateraite | K(UO₂)(SO₄)(OH)(H₂O) | — | — |
| Aegirine | NaFe³⁺Si₂O₆ | 6.3 | — |
| Aegirine-augite | (Ca,Na)(Fe³⁺,Mg,Fe²⁺)Si₂O₆ | — | — |
| Afwillite | Ca₃[SiO₃(OH)]₂·2H₂O | — | — |
| Agricolaite | K₄(UO₂)(CO₃)₃ | 4.0 | 3.53 g/cm³ |
| Ahlfeldite | NiSeO₃·2H₂O | — | — |
| Akaganeite | (Fe³⁺,Ni²⁺)₈(OH,O)₁₆Cl₁.₂₅·nH₂O | — | — |
| Akaogiite | TiO₂ | — | 3.86 g/cm³ |
| Akasakaite-(Ce) | (CaCe)(AlAlMn²⁺)O[Si₂O₇][SiO₄](OH) | — | — |
| Akasakaite-(La) | (CaLa)(AlAlMn²⁺)O[Si₂O₇][SiO₄](OH) | — | — |
| Aklimaite | Ca₄[Si₂O₅(OH)₂](OH)₄·5H₂O | — | — |
| Akopovaite | Al₄Li₂(OH)₁₂(CO₃)(H₂O)₃ | — | — |
| Akrochordite | Mn²⁺₅(AsO₄)₂(OH)₄·4H₂O | 3.5 | — |
| Alacránite | As₈S₉ | 1.5 | — |
| Alamosite | PbSiO₃ | 4.5 | 6.31 g/cm³ |
| Albertiniite | Fe²⁺(SO₃)·3H₂O | — | — |
| Alcaparrosaite | K₃Ti⁴⁺Fe³⁺(SO₄)₄O(H₂O)₂ | — | — |
| Aldomarinoite | — | — | — |
| Aldridgeite | (Cd,Ca)(Cu,Zn)₄(SO₄)₂(OH)₆·3H₂O | — | — |
| Aleksandrovite | KCa₇Sn₂Li₃Si₁₂O₃₆F₂ | — | — |
| Aleutite | [Cu₅O₂](AsO₄)(VO₄)·(Cu,K,Pb,Rb,Cs,)Cl | — | — |
| Alexkuznetsovite-(La) | — | — | — |
| Alexshubnikovite | Ca₂Cu₉(AsO₄)₄(OH)₉Cl(H₂O)₈·2H₂O | — | — |
| Alflarsenite | NaCa₂Be₃Si₄O₁₃(OH)·2H₂O | — | — |
| Aliettite | Ca₀.₂Mg₆(Si,Al)₈O₂₀(OH)₄·4H₂O | — | — |
| Allactite | Mn²⁺₇(AsO₄)₂(OH)₈ | 4.5 | — |
| Allanite-(Ce) | CaCe(Al₂Fe²⁺)[Si₂O₇][SiO₄]O(OH) | — | — |
| Allanite-(La) | CaLa(Al₂Fe²⁺)[Si₂O₇][SiO₄]O(OH) | — | — |
| Allanite-(Nd) | CaNd(Al₂Fe²⁺)[Si₂O₇][SiO₄]O(OH) | — | — |
| Allanite-(Sm) | (CaSm)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH) | — | — |
| Allanite-(Y) | {CaY}{Al₂Fe²⁺}(Si₂O₇)(SiO₄)O(OH) | — | — |
| Allanpringite | Fe³⁺₃(PO₄)₂(OH)₃·5H₂O | 3.0 | — |
| Allantoin | — | — | — |
| Alleghanyite | Mn²⁺₅(SiO₄)₂(OH)₂ | — | — |
| Allochalcoselite | Cu¹⁺Cu²⁺₅PbO₂(SeO₃)₂Cl₅ | — | — |
| Alloclasite | CoAsS | — | 6.26 g/cm³ |
| Alluaudite | (Na,Ca)(Mn,Mg,Fe²⁺)(Fe³⁺,Mn²⁺)₂(PO₄)₃ | — | — |
| Alnaperbøeite-(Ce) | (CaCe₂.₅Na₀.₅)(Al₄)(Si₂O₇)(SiO₄)₃O(OH)₂ | — | — |
| Alpersite | Mg(SO₄)·7H₂O | 2.5 | — |
| Alsakharovite-Zn | NaSrKZn(Ti,Nb)₄(Si₄O₁₂)₂(O,OH)₄·7H₂O | — | — |
| Alterite | Zn₂Fe³⁺₄(SO₄)₄(C₂O₄)₂(OH)₄ * 17H₂O | — | — |
| Altisite | Na₃K₆Ti₂Al₂Si₈O₂₆Cl₃ | — | — |
| Aluminite | Al₂SO₄(OH)₄·7H₂O | — | — |
| Aluminoceladonite | K(Mg,Fe²⁺)Al(Si₄O₁₀)(OH)₂ | — | — |
| Aluminomagnesiohulsite | Mg₂AlO₂(BO₃) | — | — |
| Alvanite | ZnAl₄(V(V)O₃)₂(OH)₁₂·2H₂O | — | 2.49 g/cm³ |
| Amarillite | NaFe³⁺(SO₄)₂·6H₂O | — | — |
| Ameghinite | NaB₃O₃(OH)₄ | — | 1.99 g/cm³ |
| Amicite | K₂Na₂(Al₄Si₄O₁₆)·5H₂O | 4.5 | — |
| Ammonioborite | (NH₄)₃B₁₅O₂₀(OH)₈·4H₂O | — | — |
| Ammoniolasalite | [(NH₄)₂Mg₂(H₂O)₂₀] [V₁₀O₂₈] | — | — |
| Ammoniotinsleyite | — | — | — |
| Amstallite | CaAl[(Al,Si)₄O₈(OH)₂](OH)₂·(H₂O,Cl) | 4.0 | — |
| Anandite | BaFe²⁺₃(Si₃Fe³⁺)O₁₀S(OH) | — | — |
| Andreadiniite | CuHgAg₇Pb₇Sb₂₄S₄₈ | — | — |
| Andreybulakhite | Ni(C₂O₄)·2H₂O | — | — |
| Andrémeyerite | BaFe²⁺₂(Si₂O₇) | 5.5 | — |
| Andyrobertsite | KCdCu₅(AsO₄)₄[As(OH)₂O₂]·2H₂O | 3.0 | 4.01 g/cm³ |
| Ankinovichite | (Ni,Zn)Al₄(V₅+O₃)₂(OH)₁₂ * 2.₅H₂O | — | — |
| Annabergite | Ni₃(AsO₄)₂·8H₂O | — | — |
| Annite | — | — | — |
| Ansermetite | Mn²⁺(V₂O₆) * 4H₂O | — | — |
| Anthonyite | — | — | — |
| Antigorite | Mg₃Si₂O₅(OH)₄ | — | 2.49 g/cm³ |
| Anzaite-(Ce) | Ce₄Fe²⁺Ti₆O₁₈(OH)₂ | — | — |
| Apachite | Cu₉Si₁₀O₂₉·11H₂O | — | — |
| Apjohnite | Mn²⁺Al₂(SO₄)₄ * 2₂H₂O | — | — |
| Aplowite | Co(SO₄)·4H₂O | — | — |
| Arakiite | ZnMn²⁺₁₂Fe³⁺₂(As³⁺O₃)(As⁵⁺O₄)₂(OH)₂₃ | — | — |
| Arangasite | Al₂(SO₄)(PO₄)F·9H₂O | — | — |
| Ardaite | Pb₁₇Sb₁₅S₃₅Cl₉ | — | — |
| Ardealite | Ca₂(PO₃OH)(SO₄)·4H₂O | — | — |
| Arfvedsonite | NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂ | — | — |
| Argandite | Mn₇(VO₄)₂(OH)₈ | — | — |