Geology and Mineralogy of Salisbury. 259 
Hornblende—lamellar, slaty and fibrous surface ferru- 
ginous brown. In veins traversing quartz—also in fibrous 
ezoups constituting the fasciculite of Hitchcock. 
ctynolite—occurs in large gray masses composed of an 
aggregation of acicular and capillary fibres, silky lustre, 
scratches glass, melts with a little intumescence into a gra 
enamel, associated with augite, mica-slate, and graphite. 
alegreen and weil in quartz and augite—also i ite * 
durated with curved layers é 
Chlorite—massive, connected with quartz. 
Argillaceous slate—in small fragments, not common. It 
occurs in place ten tiles north, in the west part of Shef. 
eld. 
Clay. —Potiers’ a: is abundant in nearly every part of 
the town. It generally lies a few feet below the surface, 
and is of a grayish white color, sometimes tinged with blue. — 
The iron ore hill lies in clay, which appears to have been 
produced by the decomposition of the slate which is of a 
very soft texture 
Sulphur.—Pulverulent on mica-slate 
Petroleum—on stagnant waters, giving enn an irised 
appearance.* 
Gr raphite—In a natural and artificial state. It is found 
in all the furnaces in irregular crystals, and scaly masses. 
It is disseminated in a mixture of calcareous lime and mica- 
slate in : — form, soft, and of a very good quality— 
abundan 
. fron. 
| Sulphuret of Iron.—Co variety in cubes and amor- 
Phous masses, also granular. Sulphate of iron is formed in 
many places by its eéompasiaiiin In limestone, quartz 
and mica-slate 
Hepatic Pyrites abundant in quartz 
Magnetic oxid of Ir —Crystallized — massive. In 
cubes ; and octaedral cryetal i in mica-sla 
\ Specular oxid of Tron—abounds in shite Acsiagee in 
Quartz. Laminae of various thickness. 
ee This appearance, in such cases, is commonly owing to tron.—En. 
