Gypsum
Hydrated calcium sulfate mineral (CaSO₄·2H₂O); also occurs as major constituent of gypsum-rich evaporite rock.
Language and route: English gypsum via Latin gypsum from Ancient Greek γύψος (gýpsos), plaster; deeper source uncertain. English gypsum via Latin gypsum from Ancient Greek γύψος (gýpsos), plaster; deeper source uncertain
Literal gloss: plaster material
The name and its history
No verified first naming act · Earliest geological use not securely page-verified
- What does the word literally mean?
- Immediate source or formation: English gypsum via Latin gypsum from Ancient Greek γύψος (gýpsos), plaster; deeper source uncertain. Literal gloss ‘plaster material’. This linguistic evidence is distinct from claims about the namer’s intentions.
- What did the original author mean?
- Greek and Roman material vocabulary grouped useful white sulfate products by preparation and behaviour, not by modern crystalline species.
- Why was the name needed?
- Later mineralogists had to distinguish a natural hydrated mineral, its dehydration products and chemically deposited sulfate rock.
- What evidence supported the original concept?
- Workability, setting after heating and rehydration, crystal shapes, later X-ray mineral structure and evaporite facies.
- How has geology changed the concept?
- Mineral gypsum is not synonymous with gypsum-bearing rock; gypsum can precipitate, hydrate from anhydrite or be remobilised.
Further historical context
Greek and Roman material vocabulary grouped useful white sulfate products by preparation and behaviour, not by modern crystalline species.
Later mineralogists had to distinguish a natural hydrated mineral, its dehydration products and chemically deposited sulfate rock.
Workability, setting after heating and rehydration, crystal shapes, later X-ray mineral structure and evaporite facies.
Mineral gypsum is not synonymous with gypsum-bearing rock; gypsum can precipitate, hydrate from anhydrite or be remobilised.
Editorial qualification
Priority and exact original naming language not independently authenticated; distinguish documented later use from first coinage.
Related names
Sources
- Online Etymology Dictionary, gypsum — English via Latin gypsum and Greek gypsos; deeper Semitic pathway only tentative
- 1911 Encyclopaedia Britannica, Gypsum, historical mineral account — historic distinction between mineral, calcined material and plaster
- British Geological Survey, Rock Classification Scheme, vol. 3 — modern descriptive classification, not evidence of historical first coinage
- BGS non-carbonate-salt rock classification — BGS explicitly prefers descriptive non-carbonate salts to potentially genetic evaporite