William Phillips

“ Fig. 1 is the primitive crystal; the angle formed by the meeting of the two faces PP has been ascertained by Haüy to be 109d. 28′, 16′′. Fig. 2 is the result of a [3] decrease on one face of the upper, and on the opposed face of the lower pyramid. This crystal has aptly been called the segment of the octahedron, as the explanatory fig. 3, will evince. Fig. 4 is the primitive crystal elongated; this elongation arises, as is obvious, from a regular increase of the crystalline laminæ on one face of the upper pyramid, and on that face of the lower to which it is united at their common base. Fig. ”

“ The number of these will doubtless be increased by future research. It does not seem requisite to offer detailed remarks on each individual crystal; it will suffice to make some occasional observations, and to note some peculiarities that might not be perfectly intelligible by the assistance of the figures alone. ”

“ In some of the most recent specimens afforded by Huel Gorland, the crystals exhibit a singular external brilliancy, occasioned, apparently, by a deposition, after the formation of the crystal, of small thin facets which cannot be detached by the knife, of the same form as the faces of the crystal itself The crystals of this substance are mostly aggregated, and frequently confusedly grouped: it is by no means common to find one in which all the solid angles are disengaged. ”

“ Through this gossan they sunk in the Muttrell Lode forty-six fathoms, and almost as many above the adit, before they arrived at any considerable quantity of the red oxyd of copper, which afterwards continued through a space ten fathoms in depth, and about six fathoms in length; being disposed in bunches, the largest and richest of which were about fifteen feet in length, by as many in depth. ”