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This is a short overview. For the background — history, value over time and notable mines — see Diorite →
A coarse-grained igneous rock, intermediate in composition between granite and gabbro, quarried in Charnwood Forest chiefly as roadstone and railway ballast rather than for any decorative or chemical use.
| Mine | Region | Worked |
|---|---|---|
| Longcliffe Quarry | Leicestershire | — |
| Midland Quarry | Warwickshire | from 1876 |
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