§ 01
Anion-led.
Strunz follows Berzelius — minerals sort first by their dominant anion. A copper sulfide and an iron sulfide are kin; a copper sulfide and a copper carbonate are not.
The Strunz table.
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Pick a class to start.
The Strunz table organises every mineral by its chemistry — class first, then division, then family. Tap any branch in the tree to surface its catalogued species.
§ 02
Four-level address.
Class · Division · Family · Sequence. The first three are chemical-structural; the fourth is editorial — when the IMA approves a new species, it slides into the right family.
§ 03
Why ten classes.
Strunz collapses Dana's seventy-eight into ten by treating crystal chemistry as the primary cleavage. Sulfates and chromates share class VII because (SO₄) and (CrO₄) are isostructural.