148 
NON-METALLIC MINERALS. 
240. Larderellite {Hydrous | 
Borate of Ammonia^. | 
Monte Rotondo, Tnscanrj. ' 
241. Nitre, or Saltpetre {Ni¬ 
trate o f Potash). 
Lower Egypt. 
242. Saltpetre, rough. 
Bengal. 
243 and 244. Saltpetre, re¬ 
fined and crystallized. 
Bengal. 
Nos. 242 to 244 presented by Messrs. 
Richardson, Brothers. 
245. Native Alum {Hydrous 
Sulphate of Potash and Alumina). 
From shaly beds under Carboni¬ 
ferous Limestone along the flanks 
of the Western Mountains, Tas¬ 
mania. 
Presented by Dr. J. Milligan. 
246. Alum, artificially crys¬ 
tallized. 
247. Alum, fine group of arti¬ 
ficial crystals. 
(Placed in the case beneath.) 
248. Alum, cube cut out of a 
crystalline mass. 
Nos. 246 to 248 presented by John 
Lee. 
249. Alum Shale, employed 
for the manufacture of Alum. 
Whitby, Yorkshire. 
250. Alum Shale, decomposing 
and showing efilorescence of Alum. 
Whitby. 
251. Green Vitriol {Hydrous 
Sulphate of Iron), in crystals, 
produced by the decomposition of 
the alum shale. 
Whitby. 
252 to 255. Alunite, or Alum 
Stone {Hydrous Sulphate of Alu¬ 
mina arid Potash), a substance 
occurrino; in laro-e rock masses. 
o o 
Muzay, Hungary. 
256. Native Sal Ammoniac 
{Chloride of Ammonium). 
From the eruption of Vesuvius, 
Peb. 18.50. 
257 and 258. Brucite {Hy¬ 
drate of Magnesia). 
Wood's Mine, Chester Co., Penn¬ 
sylvania. 
259. Epsomite, or Native 
Epsom Salt {Hydrous Sulphate 
of Magnesia). 
Western Mountains, Tasmajiia. 
Presented by Dr. J. Milligan. 
260. Kieserite {a Hydrous 
Sulphate of Magnesia). 
From the Salt Works, Stassfurth, 
near Magdeburg, Prussian 
Saxony. 
261. Stassfurthite, a variety 
of Boracite {Borate of Magnesia 
and Ch loride of Magnesium). 
Stassfurth, near Magdeburg. 
262. Carnallite {Chloride of 
Magnesmm and Potassium). 
Nos. 260 to 262 presented, from the 
International Exhibition, 1862, by the 
Zollverein Commissioners. 
263. Struvite {Hydrous Phos¬ 
phate of Magnesia and Ammonia). 
Ecund in 1845, when digging the 
foundation of the new church 
of St. Nicholas, at Hamburg. 
CxVSE E. 
Baryta and Strontia. 
The earthy oxides of Barium and Strontium are seldom met with 
except in combination with carbonic and sulphuric acids, forming the 
carbonates and sulphates of Baryta and Strontia. They are minerals 
which strongly resemble one another in most of their physical characters ; 
but whilst those of Strontia are comparatively rare, those of Baryta are 
found in numerous localities, and the sulphate (Barytes) is one of the 
commonest associates of lead ore in Derbyshire, Saxony, &c. Their 
applications in the arts are various ; Barytes is largely used as a paint, 
