Material Index
| Name | Formula | Classifications | Members | Image | Lines | Spectra | Techniques | Tags |
|---|---|---|---|---|---|---|---|---|
| Abernathyite | K(UO2)(AsO4)·3H2O | Meta-autunite (group) | — | 0 | 0 | — | Arsenate , Hydrated , Uranyl , Mineral | |
| Acanthite (group) | — | — | Aguilarite, Acanthite, Cervelleite | 0 | 0 | — | Group | |
| Actinium | Ac | — | — | 4 | 0 | — | Element , Metal | |
| Actinolite root name group | ◻Ca2(Mg0-4.5MII0.5-5)Si8O22(OH,F,Cl)2, M=FeII,MnII | Calcium amphibole | Ferro-actinolite, Actinolite | 0 | 0 | — | Silicate , Group , Hydroxide | |
| Adachiite | CaFeII3Al6(Si5AlO18)(BO3)3(OH)3(OH) | Tourmaline | — | 0 | 0 | — | Mineral, Aluminosilicate , Borate , Hydroxide | |
| Adamite | Zn2(AsO4)(OH) | Olivenite (group) | — | 4 | 0 | — | Arsenate , Mineral, Hydroxide | |
| Aegirine | NaFeIIISi2O6 | Clinopyroxene | — | 0 | 0 | — | Mineral, Silicate | |
| Aegirine-augite | (Ca,Na)(FeIII,Mg,FeII)Si2O6 | Clinopyroxene | — | 0 | 0 | — | Mineral, Silicate | |
| Afwillite | Ca3[SiO3(OH)]2·2H2O | — | — | 7 | 0 | — | Mineral, Silicate , Hydroxide , Hydrated | |
| Agakhanovite-(Y) | YCa☐2KBe3Si12O30 | Osumilite (group) | — | 0 | 0 | — | Mineral, Silicate | |
| Agrellite | NaCa2Si4O10F | — | — | 15 | 0 | — | Mineral, Silicate | |
| Aguilarite | Ag4SeS | Acanthite (group) | — | 0 | 0 | — | Mineral, Sulphide | |
| Akaogiite | TiO2 | Titanium dioxide | — | 0 | 0 | — | Mineral, Simple oxide | |
| Akhtenskite | MnO2 | — | — | 0 | 0 | — | Mineral, Simple oxide | |
| Al2SiO5 (group) | — | Nesosilicate | Andalusite (subgroup), Sillimanite, Kyanite, Sillimanite (subgroup) | 0 | 0 | — | Group |
