This quartz, the precise locality of which is unknown, is different to any that I remember having previously seen. It is apparently from a mineral vein, and consists of an assemblage of quartz pyramids, which differ from the usual form in having each angle apparently supplemented by a small prism, giving to the centre block a curious stellate appearance, fig. 8, Pl. V.

The interspaces arc filled up with minute pyramidal crystals of quartz, as well as others of chalybite and pyrites.

The fractured under surface fig. 7 shows an infinity of concentric lines of growth, the interior being composed of transparent quartz, while the outer layers are milky and opaque.