On the occurrence of Alstonite and Ullmannite (a species new to Britain) in a Barytes-Witherite vein at the New Brancepeth Colliery near Durham

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Abstract
The mining village of New Brancepeth, in the parish of Brandon and Byshottles, is situated in the Durham coalfield at a distance of four miles to the west of the city of Durham. One of the faults which intersect the sandstones, shales, and coal-seams (the Harvey, Busty, and Brockwell seams) of the Coal Measures at this place has, at its eastern end, an east to west direction with a downthrow of 120 feet and a hade of 20° to the south. Along this portion of its course the fault is of the nature of a fissure-vein, with a width varying from a few inches to 16 feet. The material filling the vein consists mainly of barytes. In places, especially where the walls of the vein are of sandstone, the pure white, massive barytes extends throughout from one sharply-defined cheek to the other.

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