| Back | Main Details | Samples & Images | Quarries | Usage | References |
| Local Name(s): | Swithland Slate. |
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| Stone Group: | Sedimentary | ||||||
| Stone Type: | Siltstone | ||||||
| Geology: |
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| Geological Sub-Divisons: | Brand Group, Swithland Formation. |
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| General Colour Description: | Dark blue/grey colour, occasionally tinged with green. |
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| Hand Specimen Description: | A siltstone which has been metamorphically induced. It is fine grained, but has a coarse slatey cleavage which can be split along irregular cleavage planes into slabs c.100mm thick. (Lott 2001: 99). It is well sorted with a smooth feel. |
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| Petrographic Description: | White mica, quartz, chlorite and accessory opaque minerals. (Clifton-Taylor & Simmons 1987: 141) |
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| General Comments: | By the end of the 18th century it was the characteristic roofing material of nearly the whole of Leicestershire and was in demand in adjoining counties (Clifton-Taylor & Simmons 1987: 166). |
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| Stone Identifiers: | Foliated. | ||||||
| Reacts dilute to HCl? | No | ||||||
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