Crystallized Sulphate of Lead
- Class 3. Metals.
- Order 1. Homogeneous.
- Gen. 15. Lead.
- Spec. 4. Sulphate of Lead.
- Div. 1. Crystallized.
- Plomb sulfaté primitif p. Haüy, 3. 504.
- Naturlischer blei vitriol. Emmerl. 3. 413.
- Native Vitriol of Lead. Kirwan, 2. 211.
This is one of the set of modifications of Sulphate of Lead which does not appear to have been noticed in any collection but my own, and shows a curious change as to the formation taking place by means of spiculæ. The inner part of the crystals are of the primitive octaëdron, apparently rounding to a new modification by decomposition, and forming spiculæ from the mutual bases of the two pyramids of the octaëdron.—This seems quite new to the mineralogical world: however, I have Carbonate of Lead in dodecaëdral crystals, looking as if decomposing, with spiculæ attached in a particular manner.