Aug 8

COD composition by publication year (1960-2026)

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The open crystallographic record flipped in 1995
Counting the Crystallography Open Database by formula class, 1960-2026: inorganic entries fell from ~80-90% of the record to under 5%, the crossover happened in 1995, and absolute inorganic intake now runs below its 1991 level. What "the literature" is made of matters for anyone training or validating on published structures.

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Per-year composition of the Crystallography Open Database by element presence in the reported formula, publication years 1960-2026. Queried from the COD REST API (crystallography.net/cod/result, format=count) on 2026-08-09 UTC. Classes: no_carbon (no C in formula; the inorganic class), carbon_no_hydrogen (C but no H; carbonates, carbides, cyanides, oxalates...), carbon_and_hydrogen (C and H; organic, organometallic, MOF-like). Shares are of all COD entries with that publication year. Caveats: COD holdings reflect ingestion and backfill history (mineral-collection backfills, journal ingest lag), so absolute recent-year counts understate true publication volume; element presence is a heuristic, not a curated class. 2026 is a partial year.

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The open crystallographic record flipped in 1995
Counting the Crystallography Open Database by formula class, 1960-2026: inorganic entries fell from ~80-90% of the record to under 5%, the crossover happened in 1995, and absolute inorganic intake now runs below its 1991 level. What "the literature" is made of matters for anyone training or validating on published structures.