Classification · Hey's Mineral Index

Hey’s index.

Hey tree

32 classes

·1Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)0
·2Carbides, Nitrides, Silicides and Phosphides0
▸3Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)0
·4Oxysulphides0
▸5Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)0
▸6Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides0
▸7Oxides and Hydroxides0
▸8Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates0
▸9Borates0
▸10Borates with other anions0
▸11Carbonates0
▸12Carbonates with other anions0
·13Nitrates0
▸14Silicates not Containing Aluminum0
·15Silicates of Aluminum0
▸16Silicates Containing Aluminum and other Metals0
▸17Silicates Containing other Anions0
▸18Niobates and Tantalates0
▸19Phosphates0
▸20Arsenates (also arsenates with phosphate, but without other anions)0
▸21Vanadates (and vanadates with arsenate or phosphate)0
▸22Phosphates, Arsenates or Vanadates with other Anions0
·23Arsenites0
▸24Antimonates and Antimonites0
▸25Sulphates0
·26Sulphates with Halide0
▸27Sulphites, Chromates, Molybdates and Tungstates0
▸28Selenites, Selenates, Tellurites, and Tellurates0
·29Iodates0
·30Thiocyanates0
▸31Oxalates, Citrates, Mellitates and Acetates0
·32Hydrocarbons, Resins and other Organic Compounds0

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Pick a group to start.

Hey's index sorts every mineral by the cations and anions it actually carries — group first, then subgroup. Tap any branch in the tree to surface its catalogued species.

§ 01

Cation by cation.

The subgroup axis is almost always the dominant cation — Cu, Mg, Ca, Fe, Mn, Ni, the rare earths. Chemistry decides the bin before crystallography is even consulted.

§ 02

Two levels, then minerals.

Group · subgroup · species — only three positions in the address. Chloritoid is 16.19.6: group 16 (Aluminum-bearing silicates), subgroup 19 (with Fe and Mg), species 6.

§ 03

Quietly retired.

Mindat froze its Hey index when Strunz absorbed the maintenance workload — the taxonomy still ships, the curation moved next door. Useful as a chemistry-first cross-reference; not the current authority on new species.