AI8 Scientific Intelligence. 
26. Bucholzite of Chester, Pennsylvania; (Berz. Jahresb., xxiv, 
1844.)—Erdmann has determined the composition of this mineral as 
follows :—silica 40°08, alumina 58°88, protoxyd of manganese 0°74= — 
99-67, which approaches that of andalusite, and gives the same for- 
mula, Al+Si3, 
27. Sillimanite ; (Ofversigt af K. V. Ac. Forhandl., 1844, 91; Berz. 
Jahresb., xxv, for 1845, 348.)—M. Staaf, in Svanberg’s laboratory has 
analyzed the Sillimanite of Pettypaug (Chester) near Saybrook in Con- 
necticut, and found for its composition, silica 33°362, alumina 58-622, 
peroxyd of iron 2-174, magnesia 0-398, lime a trace, evaporated 
0:428—98-984: which affords the formula of Kyanite, A? S?. 
28. Bismuth Silver; (Ann. des Mines, 4 Ser., vi, 165.)—Domeyko 
gives for the composition of a bismuth silver from Copiapo, 8. A., silver 
60:1, bismuth 10.1, copper 7-8, arsenic 2°8, gangue 19-2, The silver 
compound, omitting the copper, &c., equals Bi Ag’. 
29. Arsenical Antimony ; (Poggend. Ann., Ixi, 137; Berz. Jahresb., 
XXV, 1845, 334.)—This ore from Allemont in Frankreich, has been an- 
alyzed — by Rammelsberg, with the result, antimony 37° 85, arsenic 
62°15=Sb As?. 
30. Staurotide ; by M. Jacozson, foenend: Ann., Ixii, 419. \The 
staurotide of St. Gothard has afforded M. Jacobson, coder the direction 
of H. Rose, silica 29°72, alumina 54-72, peroxyd of iron 15°69, mag- 
nesia 1-35—101-98. Other analyses by him correspond nearly with 
the one here cited. The above gives the formula Al2Si or A?S, the 
oxyd of iron, being included with the alumina 
31. Scolezite and Natrolite ; (Poggend. ha: lix, 368 and 373. )- 
An analysis of scolezite by Giilich gives for its composition, silica 46°76, 
alumina 26°22, lime 13°68, water 13:94, corresponding to the simple 
formula, CaSi--Al | Si i+3Hz. 
Natrolite, according to analyses by Sander and Sokbanek. affords the 
formula NaSi+-Al Si+-2m. One of Scheerer’s analyses (of the var. 
Bergmannite) gave silica 48-12, alumina 26-96, lime 0°69, peroxyd of 
iron 0-22, soda 14-23, potash, a trace, water 10°48. 
32. On Iolite ; by W. Harpincer, (Pogg. Annal., 1846, Ixvii, 441.)— 
In an elaborate memoir on the mineral lolite, including its several va- 
rieties, M. Haidinger shows that the so-called mineral species, Pinite, 
Fahlunite, Weissite, Bonsdorffite or Hydrous Iolite, droga Chlo- 
rophyllite, Praseolite, Esmarkite, and perhaps also Oosite,* are only 
Se ek ee 
* Mt. brea i cites the suggestion jade » by Mr. Dana in his Mineralogy, (2d 
edit. p. 307,) that several of the above-enumerated minerals were derived from 
the alteration of Tolite, eye aeee eed wwe Oe 
