268 Scientific Intelligence. 
Ammonio-magnesian phosphate, imbedded in patches in the guano of 
Saldanha Bay on the coast of Africa. It occurs in distinct brilliant 
crystals, highly modified, having for its primary a right rhombic prism 
of 57° 30’ and 122° 30’, with rhombic cleavage. . The specific gravity 
is 1-60 and hardness 2. _ It afforded on analysis, ammonia 14°30, mag- 
nesia 17-00, phosphoric acid 30°40, water 38:10, —99-80, giving nearly 
the formula NH;MgO, PO,+-5HO. It is usually white and translu- 
cent, though sometimes discolored brown. Mr. Teschemacher pro- 
poses the name.guanile for this species, it being the first occurrence of 
the compound as a native salt. 
Besides these, there were detected in the guano of Saldanha Bay 
small globular particles consisting of concentric lamin, which gave on 
analysis, carbonate of lime 37: 50, carbonate of magnesia 32-00, phos- 
phate of lime 12-00, water with a little ammonia~ and animal matter 
12:00, sand 3-00, alkaline sulphates and chlorides 52°50, 99-50. 
3. Struvite, (L’Institut, No. 644. )—Like the Guanite, this mineral, 
described by M. Ulex, is a phosphate of ammonia and magnesia ; but it 
differs in containing 13 per cent. of water. The primary is a rhombic 
prism of 95° 10’; sp. gr. 17; hardness that of talc; slightly soluble 
in water. Jt was found on the site of an old church at Hamburg. 
4. Cryptolite; by F. Wouter, (Pogg. Ann., No. 3, 1846; Phil. 
Mag., xxix, 31, July, 1846.)—Cryptolite is a phosphate of the ox- 
yd of cerium, found in the sea-green or reddish apatite of Aren- 
dal in Norway. It becomes apparent when the apatite is placed 
in large pieces in dilute nitric acid, appearing, as. the apatite dissolves, _ 
in the form of fine crystalline needles of about a line in length. . It 
occurred only in the reddish variety of apatite and constituted but 2 or 
3 per cent. of the mass. It crystallizes in transparent apparently six- 
sided prisms of a very pale wine color; specific gravity 4:6. It un- 
dergoes no change at a moderate heat. It afforded on analysis per- 
oxyd of cerium 73°70, protoxyd of iron 1:51, phosphoric acid 27°37, 
==102-58. The excess arises from the cerium having been determined 
as peroxyd instead of protoxyd, in which latter form it evidently exists 
in the mineral. The presence or absence of cymiepe and lanthanum 
remains undetermined. 
_Itis probable that the apatite of Arendal contains another cerium 
mineral which is soluble, and it may possibly be monazite. 
5. On the Hematite in Connecticut ; by J. G. PercivaL, (Report 
the Geology of Connecticut, p. 182.)—The rock which contains. a 
Hematite i iron ores in the northwest part of Connecticut and the adjoin- 
_ ing part of New York, is a micaceous schist, the predominant variety 
gM wl 4 grey color, is sometimes mor more or less talcose, @ 
n : des, Greenish epi: chlorite) and 
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