Facts
- Symbol
- Se
- Atomic number
- 34
- Atomic mass
- 79.0 u
- Minerals
- 151
- Period
- 4
- Group
- 16
- Block
- p
- Melting point
- 392 °C
- Boiling point
- 1,265 °C
- Discovered
- 1817
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q876
Minerals containing this element · 151
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Achávalite | FeSe | Hexagonal | 2.5 | 4.94 g/cm³ |
| Aguilarite | Ag₄SeS | Orthorhombic | 2.5 | — |
| Ahlfeldite | NiSeO₃·2H₂O | Monoclinic | — | — |
| Alfredopetrovite | Al₂(Se⁴⁺O₃)₃·6H₂O | Hexagonal | 2.5 | — |
| Allochalcoselite | Cu¹⁺Cu²⁺₅PbO₂(SeO₃)₂Cl₅ | Monoclinic | — | — |
| Amurselite | (NH₄)₂(UO₂)₅(SeO₃)₃O₂(OH)₂(H₂O)·8H₂O | Triclinic | — | — |
| Antimonselite | Sb₂Se₃ | Orthorhombic | — | 5.51 g/cm³ |
| Arsenoústalečite | (Cu₄Cu₂)(Cu₄Cu⁺₂)(As₂Te₂)Se₁₂Se | Cubic | — | — |
| Athabascaite | Cu₅Se₄ | Orthorhombic | 2.5 | — |
| Auroselenide | AuSe | Monoclinic | — | 9.17 g/cm³ |
| Babkinite | Pb₂Bi₂(S,Se)₃ | — | — | — |
| Bambollaite | Cu(Se,Te)₂ | — | — | — |
| Bellidoite | Cu₂Se | Tetragonal | — | — |
| Bernardevansite | Al₂(SeO₃)₃·6H₂O | — | — | — |
| Berzelianite | Cu₂₋ₓSe (x~0.12) | Cubic | — | — |
| Bohdanowiczite | AgBiSe₂ | — | — | 7.72 g/cm³ |
| Bornhardtite | Co²⁺Co³⁺₂Se₄ | Cubic | 4.0 | — |
| Borzęckiite | Pb(UO₂)₃(SeO₃)₂O₂·3H₂O | — | — | — |
| Brodtkorbite | Cu₂HgSe₂ | Monoclinic | — | 7.77 g/cm³ |
| Bukovite | Cu₄Tl₂Se₄ | Tetragonal | — | — |
| Cadmoselite | CdSe | Hexagonal | 4.0 | 5.48 g/cm³ |
| Carlosruizite | K₃Na₂Na₃Mg₅(IO₃)₆(SeO₄)₆·6H₂O | Trigonal | — | — |
| Cerromojonite | CuPbBiSe₃ | Monoclinic | — | — |
| Chalcomenite | CuSe⁴⁺O₃·2H₂O | — | — | — |
| Chloromenite | Cu₉(SeO₃)₄O₂Cl₆ | — | — | — |
| Chrisstanleyite | Ag₂Pd₃Se₄ | Monoclinic | — | — |
| Chromviskontite | Pb₅Cu₂(CrO₄)₃(SeO₃)(OH)₆ | Orthorhombic | — | — |
| Clausthalite | PbSe | Cubic | — | 8.05 g/cm³ |
| Cobaltomenite | CoSe⁴⁺O₃·2H₂O | — | — | — |
| Crerarite | Pt₂-x(Bi,Pb)₁₁(S,Se)₁₁ | Triclinic | — | — |
| Crookesite | Cu₇TlSe₄ | Tetragonal | — | — |
| Demesmaekerite | Pb₂Cu₅(UO₂)₂(Se⁴⁺O₃)₆(OH)₆·2H₂O | Triclinic | — | — |
| Derriksite | Cu₄(UO₂)(Se⁴⁺O₃)₂(OH)₆ | — | — | — |
| Downeyite | SeO₂ | Tetragonal | — | 4.14 g/cm³ |
| Drysdallite | MoSe₂ | — | — | 6.51 g/cm³ |
| Dzharkenite | FeSe₂ | Cubic | 5.0 | 7.21 g/cm³ |
| Eldragónite | Cu₆BiSe₄(Se₂) | Orthorhombic | — | — |
| Eskebornite | CuFeSe₂ | Tetragonal | — | — |
| Eucairite | AgCuSe | Orthorhombic | 2.5 | — |
| Favreauite | PbBiCu₆O₄(SeO₃)₄(OH)·H₂O | Tetragonal | — | — |
| Ferroselite | FeSe₂ | Orthorhombic | — | 7.21 g/cm³ |
| Fischesserite | Ag₃AuSe₂ | Cubic | — | 8.92 g/cm³ |
| Franksousaite | PbCu(Se⁶⁺O₄)(OH)₂ | Monoclinic | — | — |
| Freboldite | CoSe | Hexagonal | — | — |
| Geffroyite | (Cu,Fe,Ag)₉(Se,S)₈ | Cubic | — | — |
| Georgbokiite | Cu₅(SeO₃)₂O₂Cl₂ | Monoclinic | — | — |
| Giraudite-(Zn) | Cu₆(Cu₄Zn₂)As₄Se₁₃ | — | — | — |
| Grundmannite | CuBiSe₂ | Orthorhombic | — | — |
| Guanajuatite | Bi₂Se₃ | — | — | 7.16 g/cm³ |
| Guangyuanite | Pb₃Cl₃(Se⁴⁺O₃)(OH) | Orthorhombic | — | — |
| Guilleminite | Ba(UO₂)₃(Se⁴⁺O₃)₂O₂·3H₂O | Orthorhombic | 2.0 | — |
| Hakite-(Cd) | Cu₆(Cu₄Cd₂)Sb₄Se₁₃ | — | — | — |
| Hakite-(Fe) | Cu₆(Cu₄Fe₂)Sb₄Se₁₃ | — | — | — |
| Hakite-(Hg) | Cu₆(Cu₄Hg₂)Sb₄Se₁₃ | — | — | — |
| Hakite-(Zn) | Cu₆(Cu₄Zn₂)Sb₄Se₁₃ | — | — | — |
| Hansblockite | (Cu,Hg)(Bi,Pb)Se₂ | Monoclinic | — | — |
| Ilinskite | (Na,K)Cu₅(SeO₃)₂O₂Cl₃ | Orthorhombic | 1.5 | — |
| Jacutingaite | Pt₂HgSe₃ | Trigonal | — | 10.58 g/cm³ |
| Jolliffeite | NiAsSe | Cubic | — | 7.09 g/cm³ |
| Junoite | Cu₂Pb₃Bi₈(S,Se)₁₆ | Monoclinic | — | — |
Minerals named after it · 9
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Antimonselite | Sb₂Se₃ | Orthorhombic | — | 5.51 g/cm³ |
| Cadmoselite | CdSe | Hexagonal | 4.0 | 5.48 g/cm³ |
| Ferroselite | FeSe₂ | Orthorhombic | — | 7.21 g/cm³ |
| Magselite | [Mg(H₂O)₆](Se⁴⁺O₃) | Trigonal | — | — |
| Palladseite | Pd₁₇Se₁₅ | Cubic | — | 8.12 g/cm³ |
| Selenodantopaite | Ag₅Bi₁₃Se₂₂ | Monoclinic | — | — |
| Selenojunoite | Cu₂Pb₃Bi₈Se₁₆ | Monoclinic | — | — |
| Selenopolybasite | Cu(Ag,Cu)₆Ag₉Sb₂(S,Se)₉Se₂ | Trigonal | — | — |
| Selenostephanite | Ag₅SbSe₄ | — | — | — |