Aug 8

COD space-group distribution by publication year, no-carbon class (1960-2026)

year	sg_hm	n_entries	sg_number	share_of_noc	crystal_system
1960	Fm-3m	28	225	0.11765	cubic
1960	Pm-3m	19	221	0.07983	cubic
1960	P63/mmc	19	194	0.07983	hexagonal
1960	P6/mmm	18	191	0.07563	hexagonal
1960	Fd-3m	14	227	0.05882	cubic
1960	Pnma	12	62	0.05042	orthorhombic
1960	P21/c	11	14	0.04622	monoclinic
1960	F-43m	9	216	0.03782	cubic
1960	null	9	229	0.03782	cubic
1960	null	9	164	0.03782	trigonal
1960	C2/m	7	12	0.02941	monoclinic
1960	P4/mmm	6	123	0.02521	tetragonal

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Aug 8

COD space-group distribution by publication year, no-carbon class (1960-2026)

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Sixty-five years of symmetry: the fossil record of how structures get made
Per-space-group analysis of the COD's inorganic (no-carbon) class, 1960-2026: cubic falls from 37-42% (film era) to ~12%, monoclinic becomes modal, cuprates arrive in I4/mmm in 1987, and the P1 share jumps 20x after 2021 as computational papers (a generative-model electrolyte search, DFT supercell batches) deposit their working cells into the database of record.

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Per-space-group entry counts within the Crystallography Open Database's inorganic (no-carbon formula) class, by publication year, 1960-2026 (2026 partial through early August). Harvested from the COD REST API on 2026-08-09: one CSV query per publication year, entries classified as no-carbon by element-token match on the COD formula fields, grouped by COD's normalized sgNumber. 226 distinct space groups appear. Companion to the COD composition-flip dataset (019fe3d8-6612-7381-bc5b-2e66e05b836d); no-C totals agree with server-side element-filter counts to <1%. Use cases: symmetry-mix trends, high-throughput fingerprint detection, crystallographic era analysis.

year	sg_hm	n_entries	sg_number	share_of_noc	crystal_system
1960	Fm-3m	28	225	0.11765	cubic
1960	Pm-3m	19	221	0.07983	cubic
1960	P63/mmc	19	194	0.07983	hexagonal
1960	P6/mmm	18	191	0.07563	hexagonal
1960	Fd-3m	14	227	0.05882	cubic
1960	Pnma	12	62	0.05042	orthorhombic
1960	P21/c	11	14	0.04622	monoclinic
1960	F-43m	9	216	0.03782	cubic
1960	null	9	229	0.03782	cubic
1960	null	9	164	0.03782	trigonal
1960	C2/m	7	12	0.02941	monoclinic
1960	P4/mmm	6	123	0.02521	tetragonal

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Rows: 5,803
Columns: 8
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Referenced by

Sixty-five years of symmetry: the fossil record of how structures get made
Per-space-group analysis of the COD's inorganic (no-carbon) class, 1960-2026: cubic falls from 37-42% (film era) to ~12%, monoclinic becomes modal, cuprates arrive in I4/mmm in 1987, and the P1 share jumps 20x after 2021 as computational papers (a generative-model electrolyte search, DFT supercell batches) deposit their working cells into the database of record.