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| Symbol | CaSO4 |
|---|
This is a short overview. For the background — history, value over time and notable mines — see Anhydrite →
The anhydrous form of calcium sulphate, formed alongside gypsum where evaporite beds have been buried deeply enough to drive off their water of crystallisation. It is harder and denser than gypsum and will not make plaster directly, so it was long treated as a contaminant, but it is used in cement manufacture and as a source of sulphur compounds.
| Mine | Region | Worked |
|---|---|---|
| Billingham Anhydrite Mine | Stockton-on-Tees | 1927 (sinking from 1926)–1971 (shaft capped 1978) |
| Brightling and Mountfield Gypsum Mines | East Sussex | from 1876 (Mountfield) |
| Cocklakes Mine | Cumbria | Early 1860s–1930 |
| Long Meg Mine | Cumbria | 1880–January 1976 |
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