Minerals found in rock exposed due to road widening, most recently in 1989-90 when a second carriageway was constructed. Embankment formed at the time now grassed over.
Ref: Alabaster, C., 1990. Alstonite and barytocalcite from Llantrisant, South Wales and barytocalcite from Holwell, Mendip Hills, England. Journal of the Russell Society, 3, 1-6.
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UK OS Grid Reference: ST051820
Map Reference: 51°31'42"N , 3°22'5"W
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Mineral List: |
Alstonite  | | | | Description: | Crystals typically 1mm or less, commonly replaced by barite | | Reference: | [Alabaster, C. 1990. Alstonite and barytocalcite from Llantrisant, South Wales and barytocalcite from Holwell, Mendip Hills, England. Journal of the Russell Society, 3, 1-6.] |
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Aragonite | | | | Description: | Witherite usually has surface alteration to barite | | Reference: | [No reference listed] |
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Baryte | | | | Description: | Witherite usually has surface alteration to barite | | Reference: | [No reference listed] |
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Calcite | | | | Description: | Witherite usually has surface alteration to barite | | Reference: | [No reference listed] |
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Covellite | | | | Reference: | [Bowler & Kingston (1971)] |
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Goethite | | | | Description: | Witherite usually has surface alteration to barite | | Reference: | [No reference listed] |
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Malachite | | | | Description: | minor malachite coats goethite replacing altered chalcopyrite | | Reference: | [National Museum of Wales specimens] |
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Witherite  | | | | Description: | Witherite usually has surface alteration to barite
Forms aggregates of platey crystals to 40mm or more | | Reference: | [] |
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8 entries listed. 8 valid minerals.
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