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Introduction: Why Symmetry Still Matters

Imagine gazing through a microscope at a tiny crystal that might just hold the answer to your latest scientific question. In front of you is a wonder of nature, where symmetry and mathematics intertwine. For many chemistry researchers, crystallography is the ultimate tool, as it reveals the true arrangement of atoms within matter. Yet, as technology has made these measurements easier to obtain, one question remains as tricky as ever: How do we choose the correct space group for a crystal structure?

 Left to right: Professor Atsushi Nakagawa, Dr Chun-Jung Chen, Kruna Vukmirovic, Kezia Bowman, Santiago García Granda
Letter from the president

As we approach the end of 2025 and look ahead to 2026 and our 27th Congress and General Assembly, I would like to share a message of positivity and optimism about the future of our Union.

Feature article

Charge Density Analysis of Zircon (ZrSiO₄) Using Quantum Crystallographic Methods
IUCr supported events

Charge density analysis is one important branch of crystallography research.

 The Bernal Lecture given by John L. Finney at Birkbeck College, 23 September 2025
Feature article

The Bernal Lecture given by John L. Finney at Birkbeck College, 23 September 2025

 Decorative representation of the crystal structure of MOF UiO-66 (CSD refcode: RUBTAK03).
Feature article

Decorative representation of the crystal structure of MOF UiO-66 (CSD refcode: RUBTAK03).

Training in Remote Crystallography Strengthens Skills and Supports African Collaboration
Outreach

Dr Nessreen Abdelfatah Ali Abdoun recently completed the UNESCO–UNESRALE training programme, Remote Access to a Single-Crystal X-ray Diffractometer for African Scientists, hosted at the University of Lorraine, Nancy, France (1–26 September 2025).

 A copper porphyrin network with underlying PtS topology.
Feature article

A copper porphyrin network with underlying PtS topology.

From the Community

6th International School on Aperiodic Crystals 2025 in Dresden, Germany
Meeting Report (IUCr supported)

From September 1 to 5, 2025, the 6th International School on Aperiodic Crystals (ISAC-6) took place at the Max Planck Institute for Chemical Physics of Solids (MPI CPfS) in Dresden, Germany.

 A group photo of participants of the 27th Heart of Europe Bio-Crystallography meeting in Halberstadt, Germany.
Meeting Report

A group photo of participants of the 27th Heart of Europe Bio-Crystallography meeting in Halberstadt, Germany.

CCDC
Notices

We’re excited to share the latest CSD Data and Software release, featuring innovative tools and functionalities designed for our users.

From Industry

 Figure 1. SAXSpoint 700 instrument with mounted Rheo-SAXS module.
New products

Figure 1. SAXSpoint 700 instrument with mounted Rheo-SAXS module.

Articles from the journals

 Our new Co-editors, (top, left to right) Sharon Bone, Yan-Gu Lin, Anders Madsen, (bottom, left to right) Elke Plönjes, Marius Retegan, Changyong Song and Zhonghua Wu.
IUCr Journals News

Our new Co-editors, (top, left to right) Sharon Bone, Yan-Gu Lin, Anders Madsen, (bottom, left to right) Elke Plönjes, Marius Retegan, Changyong Song and Zhonghua Wu.

 Quantum Crystallography: the 100-year revolution
Feature article

This article is part of a collection of articles on Quantum Crystallography, and commemorates the 100th anniversary of the development of Quantum Mechanics.

 The structure of Nd2Fe14B viewed down the a axis, reproduced from Vosegaard et al. (2025).
Commentary

The structure of Nd2Fe14B viewed down the a axis, reproduced from Vosegaard et al. (2025).

Phase Transition Ilustration
Commentary

At a phase transition, a material changes structure and properties. The most fundamental phase transitions are obvious to the eye; the melting of ice or the boiling of water.

 Focus on Quantum Crystallography
Editorial

This article is part of a collection of articles on Quantum Crystallography, and commemorates the 100th anniversary of the development of Quantum Mechanics.

People and History

Professor Sir Peter Hirsch FRS (1925-2025): a scientific giant
Obituary

Sir Peter Hirsch, affectionally known as ‘PBH’ to his many friends, pioneered the use of transmission electron microscopy to study defects in crystals, particularly dislocations, and modelled the mechanical properties of a wide range of materials in terms of their defect struc

 Werner in his office looking through a structure model of a zeolite.
Obituary

Werner in his office looking through a structure model of a zeolite.

Aris Terzis (1941–2025)
Obituary

Dr Aris Terzis (1941–2025) was the Director of the Crystallography Laboratory at the former Institute of Materials Science (now Institute of Nanoscience and Nanotechnology) at the National Center of Scientific Research “Demokritos” (Athens, Greece), serving from 1979 until his

 Gregory Beaucage (2 May 1958–14 July 2025).
Obituary

Gregory Beaucage (2 May 1958–14 July 2025).