crystal system: meaning, definition, pronunciation and examples
C2Academic, Scientific, Technical
Quick answer
What does “crystal system” mean?
A classification scheme in crystallography that groups crystal structures based on the symmetry and geometric properties of their unit cells.
Audio
Pronunciation
Definition
Meaning and Definition
A classification scheme in crystallography that groups crystal structures based on the symmetry and geometric properties of their unit cells.
A fundamental concept in materials science, mineralogy, and solid-state physics describing one of seven groups (cubic, hexagonal, trigonal, etc.) into which all crystals can be classified according to their inherent symmetry and the lengths and angles of their axes. It can also be used metaphorically to describe any highly ordered, structured system.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or conceptual differences. Spelling of related terms may vary (e.g., 'centred' vs. 'centered' unit cell).
Connotations
Identical technical connotations in both varieties.
Frequency
Equally low-frequency and specialized in both UK and US academic contexts.
Grammar
How to Use “crystal system” in a Sentence
The mineral [SUBJECT] crystallises in the [CRYSTAL SYSTEM][CRYSTAL NAME] belongs to the [CRYSTAL SYSTEM]The [CRYSTAL SYSTEM] is characterised by [FEATURE]Vocabulary
Collocations
Examples
Examples of “crystal system” in a Sentence
adjective
British English
- The crystal-system classification is fundamental.
- They performed a crystal-system analysis.
American English
- The crystal-system classification is fundamental.
- They performed a crystal-system analysis.
Usage
Meaning in Context
Business
Virtually never used, except potentially in highly specialized businesses like semiconductor manufacturing or gemology.
Academic
Core term in geology, materials science, chemistry, and physics courses and research.
Everyday
Extremely rare. Might be encountered in documentaries about gems or minerals.
Technical
Essential terminology in crystallography, mineralogy, metallurgy, and solid-state physics.
Vocabulary
Synonyms of “crystal system”
Strong
Neutral
Weak
Vocabulary
Antonyms of “crystal system”
Watch out
Common Mistakes When Using “crystal system”
- Using 'crystal system' interchangeably with 'crystal structure' (the latter is a specific instance). Saying 'crystal systems' for a single mineral's classification.
- Confusing 'trigonal' and 'hexagonal' systems.
FAQ
Frequently Asked Questions
There are seven universally recognized crystal systems: cubic, tetragonal, orthorhombic, hexagonal, trigonal, monoclinic, and triclinic.
No. A crystal system is a broad classification based on symmetry (e.g., cubic). A crystal structure is a specific arrangement of atoms within that system (e.g., the diamond cubic structure within the cubic system).
The cubic (or isometric) system is often considered the simplest due to its high symmetry, with all axes equal in length and all angles 90 degrees.
It determines many of a crystal's physical properties, such as cleavage, optical behaviour, and thermal expansion, making it a fundamental predictive tool in materials science and mineralogy.
Crystal system is usually academic, scientific, technical in register.
Crystal system: in British English it is pronounced /ˈkrɪstl ˌsɪstəm/, and in American English it is pronounced /ˈkrɪstl ˌsɪstəm/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[Not applicable for this highly technical term]”
Learning
Memory Aids
Mnemonic
Think of the seven crystal systems as seven different 'shapes of boxes' (unit cells) that nature uses to pack atoms neatly.
Conceptual Metaphor
A crystal system is the underlying architectural blueprint or geometric rulebook for a crystal's structure.
Practice
Quiz
What is the primary basis for classifying a crystal into a crystal system?