Crystallized Carbonate of Barytes

I am indebted to the munifience of F. Hall, Esq., for some superb specimens of Carbonate and Sulphate of Barytes. Among them was the present specimen of Carbonate of Barytes; and as it is the first time that it has been noticed with elongated spiculæ so distinctly seen in hexaëdral pyramids, I am pleased at the opportunity of exhibiting a figure of them. They form an irregular echinated sphere, on a gangue of Galæna or Sulphuret of Lead: see the upper figure. They are found to be fusible by the blowpipe.

The lower figure on the right hand is a group of the spiculated crystals: on the left hand is a geometrical outline distinguishing the facets, three of which do not reach so high: sometimes these last are scarcely to be seen, and the spiculæ seem to have only three sides.

It is from Arkendale, near Richmond, Yorkshire.