* 
Mineralogy and Geology. 273 
the latter must be allowed. Of the other glucina compounds, chryso- 
beryl may be a trimetric and euclase a monoclinic quartz. With the 
former are associated staurolite, andalusite, topaz, &c.” [If we calcu- 
late the angle of the form 4R for quartz, we find it 126° 52’, which is 
or 8 degrees larger than that of the common rhombohedron of phe- 
and chloritoid ; wichtyne, epidote, &c. 
Analysis of Caporcianite and Humboldtite ; Menzcuini and Becut. 
This Jour., xiii, 62 and 65. 
Heulandite.—This mineral, according to Mr. G. W. Fahnestock, oc- 
curs in small prismatic crystals covering the sides of fissures in a orn- 
rusty from oxyd of iron, which has probably proceeded from the de- 
composition of the rock. 
Form like that of garnet; crystals sometimes half an inch through. 
i Fe Ca Mn T&G Meck 
: 88°355 34°598 25804 1°807 3-071 trace = 99°319 
Oxygen 17:30 7-66 732 O44 
The mineral differs from all garnets in its infusibility and its perfect 
solubility in acids. It may hereafter be proved to be a partly altered 
es but it is more probable, the author states, that it is a new 
var 
Garnet from Gustafsberg with Stilbite——Analysis by Bann, (J. f. pr. 
Chem. liii, 312.) 
i Al F Fe Oa Mn Mg 
37°80 11-18 15°66 497 80°28 «=: O18 trace 
Oxygen 19°63 5-22 4-70 100° «861 «= 0-02 
It gives the usual formula R* Si+ #Si. Specific gravity 36. 
On the Composition of Epidote.—RaMMELSBERG, in Pogg. Ann. 
lxxxiv, 453, Bea the of ie M. Hermann with regard to the com- 
Position of epidote, and sustains the conclusion that the oxygen ratio for 
the protoxyds, peroxyds and silica, is essentially 1:2: 3. : 
Chrome Tourmalines.The Siberian tourmalines sometimes contain 
a small amount of oxyd of chromium. They are In acicular groups 
and have a fine green color; 7:0, G.=3'181. Fusible.—Prof. 
Cuarman, Phil, Mag. [4]. — 
Srconp Sznuss, a, Sm 41,—Sept., 1852. 35 
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