Facts
- Symbol
- Mg
- Atomic number
- 12
- Atomic mass
- 24.3 u
- Minerals
- 793
- Period
- 3
- Group
- 2
- Block
- s
- Melting point
- 649 °C
- Boiling point
- 1,100 °C
- Discovered
- 1755
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q660
Minerals containing this element · 793
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Achyrophanite | (K,Na)₃(Fe³⁺,Ti,Al,Mg)₅O₂(AsO₄)₅ | Orthorhombic | — | — |
| Actinolite | Ca₂(Mg,Fe)₅[OH|Si₄O₁₁]₂ | Monoclinic | — | — |
| Adelite | CaMgAsO₄(OH) | Orthorhombic | 5.0 | — |
| Admontite | MgB₆O₁₀·7H₂O | Monoclinic | — | — |
| Adrianite | Ca₁₂(Al₄Mg₃Si₇)O₃₂Cl₆ | Cubic | — | — |
| Aegirine-augite | (Ca,Na)(Fe³⁺,Mg,Fe²⁺)Si₂O₆ | Monoclinic | — | — |
| Aerinite | (Ca,Na)₆(Fe³⁺,Fe²⁺,Mg,Al)₄(Al,Mg)₆Si₁₂O₃₆(OH)₁₂(CO₃)·12H₂O | — | 3.0 | 2.48 g/cm³ |
| Akimotoite | MgSiO₃ | Trigonal | — | — |
| Aksaite | MgB₆O₇(OH)₆·2H₂O | Orthorhombic | — | — |
| Albrechtschraufite | MgCa₄F₂[UO₂(CO₃)₃]₂·17-18H₂O | Triclinic | 2.8 | 2.60 g/cm³ |
| Aldermanite | Mg₅Al₁₂(PO₄)₈(OH)₂₂·32H₂O | Orthorhombic | 2.0 | — |
| Aliettite | Ca₀.₂Mg₆(Si,Al)₈O₂₀(OH)₄·4H₂O | Monoclinic | — | — |
| Alluaudite | (Na,Ca)(Mn,Mg,Fe²⁺)(Fe³⁺,Mn²⁺)₂(PO₄)₃ | Monoclinic | — | — |
| Almarudite | K(☐,Na)₂(Mn,Fe,Mg)₂[(Be,Al)₃Si₁₂]O₃₀ | Hexagonal | 6.0 | 2.72 g/cm³ |
| Alpeite | Ca₄Mn³⁺₂Al₂(Mn³⁺Mg)(SiO₄)₂(Si₃O₁₀)(V₅+O₄)(OH)₆ | Orthorhombic | — | — |
| Alpersite | Mg(SO₄)·7H₂O | Monoclinic | 2.5 | — |
| Althausite | Mg₄(PO₄)₂(OH,O)(F,☐) | Orthorhombic | — | — |
| Aluminoceladonite | K(Mg,Fe²⁺)Al(Si₄O₁₀)(OH)₂ | Monoclinic | — | — |
| Aluminocopiapite | (Al,Mg)Fe³⁺₄(SO₄)₆(OH,O)₂·20H₂O | Triclinic | — | — |
| Aluminomagnesiohulsite | Mg₂AlO₂(BO₃) | Monoclinic | — | — |
| Alumovesuvianite | Ca₁₉Al(Al₁₀Mg₂)Si₁₈O₆₉(OH)₉ | Tetragonal | — | — |
| Alumoåkermanite | (Ca,Na)₂(Al,Mg,Fe²⁺)(Si₂O₇) | Tetragonal | — | — |
| Amesite | Mg₂Al(AlSiO₅)(OH)₄ | Triclinic | — | — |
| Ammoniolasalite | [(NH₄)₂Mg₂(H₂O)₂₀] [V₁₀O₂₈] | Monoclinic | — | — |
| Ammoniomagnesiovoltaite | (NH₄)₂Mg₅Fe³⁺₃Al(SO₄)₁₂·18H₂O | Cubic | — | — |
| Anatolyite | Na₆(Ca,Na)(Mg,Fe³⁺)₃Al(AsO₄)₆ | Trigonal | — | — |
| Angastonite | CaMgAl₂(PO₄)₂(OH)₄·7H₂O | Amorphous | — | — |
| Ankerite | Ca(Fe²⁺,Mg)(CO₃)₂ | Trigonal | — | 3.00 g/cm³ |
| Anthophyllite | ☐Mg₂Mg₅Si₈O₂₂(OH)₂ | Orthorhombic | — | — |
| Antigorite | Mg₃Si₂O₅(OH)₄ | Monoclinic | — | 2.49 g/cm³ |
| Apexite | NaMg(PO₄)·9H₂O | Triclinic | — | — |
| Ardennite-(As) | Mn²⁺₄Al₄(AlMg)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆ | Orthorhombic | — | — |
| Ardennite-(V) | Mn²⁺₄Al₄(AlMg)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆ | Orthorhombic | — | — |
| Aristarainite | Na₂MgB₁₂O₂₀ * 8H₂O | Monoclinic | — | — |
| Armalcolite | (Mg,Fe²⁺)Ti₂O₅ | Orthorhombic | — | — |
| Arseniopleite | (Ca,Na)NaMn²⁺(Mn²⁺,Mg,Fe²⁺)₂(AsO₄)₃ | Monoclinic | — | — |
| Arsenowagnerite | Mg₂(AsO₄)F | Monoclinic | — | — |
| Arsenudinaite | NaMg₄(AsO₄)₃ | Tetragonal | — | 3.83 g/cm³ |
| Artinite | Mg₂CO₃(OH)₂·3H₂O | Monoclinic | 2.5 | — |
| Asbolane | Mn⁴⁺(O,OH)₂·(Co,Ni,Mg,Ca)ₓ(OH)₂ₓ·nH₂O | Hexagonal | — | — |
| Aspidolite | NaMg₃(AlSi₃O₁₀)(OH)₂ | Monoclinic | — | — |
| Atencioite | Ca₂Fe²⁺₃Mg₂Be₄(PO₄)₆(OH)₄ * 6H₂O | Triclinic | — | — |
| Augite | (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)₂O | Monoclinic | — | — |
| Axinite-(Mg) | Ca₂MgAl₂BSi₄O₁₅OH | Triclinic | — | — |
| Azoproite | Mg₂(Ti₀.₅Mg₀.₅)O₂(BO₃) | Orthorhombic | 5.5 | — |
| Badalovite | NaNaMg(MgFe³⁺)(AsO₄)₃ | Monoclinic | — | — |
| Baileychlore | (Zn,Fe²⁺,Al,Mg)₆(Si,Al)₄O₁₀(OH)₈ | Triclinic | — | — |
| Balangeroite | (Mg,Fe²⁺,Fe³⁺,Mn²⁺)₄₂Si₁₆O₅₄(OH)₄₀ | — | — | — |
| Balipholite | BaLiMg₂Al₃(Si₂O₆)₂(OH)₄ | Orthorhombic | — | — |
| Barićite | (Mg,Fe)₃(PO₄)₂·8H₂O | — | — | — |
| Barroisite | ☐NaCa[Mg₃Al₂](Si₇Al)O₂₂(OH)₂ | Monoclinic | 5.5 | — |
| Bayleyite | Mg₂(UO₂)(CO₃)₃ * 18H₂O | Monoclinic | — | — |
| Baylissite | K₂Mg(CO₃)₂·4H₂O | Monoclinic | — | — |
| Beryllocordierite-Na | NaMg₄(Al₅Be)(AlSi₅O₁₈)₂·2H₂O | Orthorhombic | — | — |
| Berzeliite | (NaCa₂)Mg₂(AsO₄)₃ | Cubic | — | — |
| Betpakdalite-CaMg | [Ca₂(H₂O)₁₇Mg(H₂O)₆][Mo⁶⁺₈As⁵⁺₂Fe³⁺₃O₃₆(OH)] | Monoclinic | — | — |
| Bicapite | [KNa₂Mg₂(H₂O)₂₅][H₂PV₅+₁₂O₄₀(V₅+O)₂] | — | — | — |
| Bischofite | MgCl₂·6H₂O | Monoclinic | — | — |
| Bjarebyite | (Ba,Sr)(Mn²⁺,Fe²⁺,Mg)₂Al₂(PO₄)₃(OH)₃ | Monoclinic | — | — |
| Bluestreakite | K₄Mg₂(V⁴⁺₂V⁵⁺₈O₂₈)·14H₂O | Monoclinic | 2.0 | — |
Minerals named after it · 53
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Ammoniomagnesiovoltaite | (NH₄)₂Mg₅Fe³⁺₃Al(SO₄)₁₂·18H₂O | Cubic | — | — |
| Faujasite-Mg | (Mg,Na,K,Ca)₂(Si,Al)₁₂O₂₄·15H₂O | Cubic | — | — |
| Julgoldite-(Mg) | Ca₂MgFe³⁺₂(Si₂O₇)(SiO₄)(OH)₂·H₂O | Monoclinic | — | — |
| Labuntsovite-Mg | Na₄K₄Mg₂Ti₈O₄(Si₄O₁₂)₄(OH)₄·10-12H₂O | — | — | — |
| Maghagendorfite | (Na,☐)MgMn(Fe,Fe)₂(PO₄)₃ | — | — | — |
| Magnesio-arfvedsonite | NaNa₂(Mg₄Fe³⁺)Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Magnesio-dutrowite | Na(Mg₂.₅Ti₀.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O | Trigonal | — | — |
| Magnesio-ferri-fluoro-hornblende | ☐Ca₂(Mg₄Fe³⁺)(Si₇Al)O₂₂F₂ | Monoclinic | — | — |
| Magnesio-fluoro-arfvedsonite | NaNa₂(Mg₄Fe³⁺)Si₈O₂₂F₂ | Monoclinic | 5.5 | — |
| Magnesio-fluoro-hastingsite | NaCa₂(Mg₄Fe³⁺)(Si₆Al₂)O₂₂F₂ | Monoclinic | — | — |
| Magnesio-fluoro-riebeckite | ◻Na₂(Mg₃Fe³⁺₂)(Si₈O₂₂)F₂ | Monoclinic | — | — |
| Magnesio-foitite | (☐,Na)(Mg₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | Trigonal | 7.0 | — |
| Magnesio-hastingsite | NaCa₂(Mg₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂ | Monoclinic | — | — |
| Magnesio-hornblende | ☐Ca₂(Mg₄Al)(Si₇Al)O₂₂(OH)₂ | Monoclinic | 5.5 | — |
| Magnesio-lucchesiite | CaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O | Trigonal | — | — |
| Magnesio-riebeckite | ☐Na₂(Mg₃Fe³⁺₂)Si₈O₂₂(OH)₂ | Monoclinic | 6.0 | — |
| Magnesioalterite | Mg₂Fe³⁺₄(SO₄)₄(C₂O₄)₂(OH)₄·17H₂O | Monoclinic | — | — |
| Magnesioaubertite | (Mg,Cu)Al(SO₄)₂Cl * 14H₂O | — | — | — |
| Magnesiocanutite | NaMnMg₂[AsO₄]₂[AsO₂(OH)₂] | Monoclinic | — | — |
| Magnesiocarpholite | (Mg,Fe²⁺)Al₂(Si₂O₆)(OH)₄ | — | — | — |
| Magnesiochangesite-(Ce) | (Ca₈Ce)□Mg(PO₄)₇ | Trigonal | — | — |
| Magnesiochangesite-(Y) | (Ca₈Y)◻Mg(PO₄)₇ | Trigonal | — | — |
| Magnesiochloritoid | MgAl₂O(SiO₄)(OH)₂ | Monoclinic | — | — |
| Magnesiochlorophoenicite | (Mg,Mn)₃Zn₂(AsO₄)(OH,O)₆ | Monoclinic | — | — |
| Magnesiochromite | MgCr³⁺₂O₄ | Cubic | 5.5 | — |
| Magnesiocopiapite | MgFe³⁺₄(SO₄)₆(OH)₂ * 20H₂O | — | — | — |
| Magnesiocoulsonite | MgV₂O₄ | Cubic | — | — |
| Magnesioferrite | MgFe³⁺₂O₄ | Cubic | — | — |
| Magnesiofluckite | CaMg(AsO₃OH)₂(H₂O)₂ | Triclinic | — | — |
| Magnesiohatertite | (Na,Ca)₂Ca(Mg,Fe³⁺)₂(AsO₄)₃ | Monoclinic | — | — |
| Magnesiohulsite | Mg₂Fe³⁺O₂(BO₃) | Monoclinic | — | — |
| Magnesiohögbomite-2N2S | — | Hexagonal | — | — |
| Magnesiohögbomite-2N3S | [(Mg,Fe²⁺,Zn)₄(Al,Ti,Fe³⁺)₁₀O₁₉(OH)]₂ | Trigonal | — | — |
| Magnesiohögbomite-2N4S | [(Mg₈.₄₃Fe²⁺₁.₅₇)Σ=₁₀Al₂₂Ti⁴⁺₂O₄₆(OH)₂] | Hexagonal | — | — |
| Magnesiohögbomite-6N6S | [(Mg,Fe²⁺)₃(Al,Ti,Fe³⁺)₈O₁₅(OH)]₆ | Trigonal | — | — |
| Magnesiokoritnigite | Mg(AsO₃OH)·H₂O | Triclinic | — | — |
| Magnesioneptunite | KNa₂Li(Mg,Fe)₂Ti₂Si₈O₂₄ | Monoclinic | — | — |
| Magnesionigerite-2N1S | (Mg,Al,Zn)₂(Al,Sn)₆O₁₁(OH) | — | — | — |
| Magnesionigerite-6N6S | (Mg,Al,Zn)₃(Al,Sn,Fe)₈O₁₅(OH) | — | — | — |
| Magnesiopascoite | Ca₂Mg(V₁₀O₂₈)·16H₂O | Monoclinic | 2.5 | — |
| Magnesioqingheiite | Na₂Mg(MgAl)(PO₄)₃ | Monoclinic | — | — |
| Magnesiorowlandite-(Y) | Y₄(Mg,Fe)(Si₂O₇)₂F₂ | Triclinic | — | — |
| Magnesiostaurolite | Mg(Mg,Li)₃(Al,Mg)₁₈Si₈O₄₄(OH)₄ | — | — | — |
| Magnesiotaaffeite-6N'3S | Mg₂BeAl₆O₁₂ | — | — | — |
| Magnesiovesuvianite | Ca₁₉Mg(Al₁₀Mg₂)(Si₂O₇)₄(SiO₄)₁₀(OH)₁₀ | Tetragonal | — | — |
| Magnesiovoltaite | K₂Mg₅Fe³⁺₃Al(SO₄)₁₂*₁₈H₂O | Cubic | — | — |
| Magnesiozippeite | Mg(UO₂)₂(SO₄)O₂ * 3.₅H₂O | Monoclinic | — | — |
| Magnesite | MgCO₃ | Trigonal | — | 2.96 g/cm³ |
| Mazzite-Mg | Mg₅(Si₂₆Al₁₀)O₇₂·30H₂O | Hexagonal | — | — |
| Nitromagnesite | Mg(NO₃)₂·6H₂O | Monoclinic | — | — |
| Osumilite-(Mg) | KMg₂Al₃(Al₂Si₁₀)O₃₀ | Hexagonal | 6.5 | — |
| Oxo-magnesio-hastingsite | NaCa₂(Mg₂Fe³⁺₃)(Si₆Al₂)O₂₂O₂ | Monoclinic | 6.0 | — |
| Paratacamite-(Mg) | Cu₃(Mg,Cu)Cl₂(OH)₆ | Trigonal | — | — |