Carbonate of Barytes

Tab. 127 shows the acute dodecaëdron of the Carbonate of Barytes; tab. 109, the elongated hexaedrul spiculæ; and the six-sided column is shown in tab. 239: it remains that the present rare and unexpected variety should be shown, being the usual acute dodecaëdron, having its apices replaced by very obtuse six-sided pyramids of such extent as nearly to destroy its faces. The specimens are from Alstone moor, and are in groups more or less confused, and in great variety of directions; they are commonly covered with very small rounded prisms of Sulphate of Barytes, apparently produced by their partial decomposition.