M ineralagy. and Geology. 439 
es emerald green; lustre greasy ; hardness ae that it has been 
considered a ip walaiys G, =2°622. Attacked completely by aomes 
Si x - he Ma Ca Me (by diff) 
88°29 26°54 trace 0°59 trace 0°67 22:16 Ii: 65—=100 
Pyrosclerite is often confounded with aay “9008 its structure is 
usually more or less foliated, though sometimes fibro 
On Pimelite—W. Barr (J. f. pr. Chem. lv, 49) has analyzed one 
of two minerals called Pimelite by Karsten—the harder kind—and ob- 
tained, as the mean of two analyses 
Si He uote Ni tt 
35°80 269 23°04 14°66 2-78 21-08=100 
Oxygen, 18:60 0-81 10°79 5-69 0:50 18°69 
The oxygen ratio for the ae protoxyds, peroxyds and silica, is 
18:69 : 6:28 : 11-60 : 18-60, whence M. Baer deduces the ratio 3; 1:2 
:3, and the formula (Mg, Ni)? Si+2 (Al, Be) Si-toHt. 
Specific gravity 2°71 to 2°76. Heated in a tube, blackens and yields 
water and a bituminous odor. . with soda gives a slag, and some 
nickel may be washed from the charcoal. H. 2: 5; lustre waxy ; feel 
Dissolve translucent on the edges; does not adhere to the tongue. 
osetia in muriatic ee even after heating. 
i, 134). 
A silesian iasal ana lyze ed by C. Schmidt (Pogg. Ann. si, 986, 
and called Pimelite, is a different species, and is called Alizite 
Glocker. Its specific gravity is 1-44—1-46. Composition: 
Si M Fre te oe 
5463 <a 5:89 113 016 0°30 
Be = oxygen ratio 1:2: 6, and the formula 2(Ni, Mg) si tt 
Pipe ys from Nassau.—F resents, after separating the sand and 
hydrated ane from aclay from Nassau, gives the following for its 
Mposition, according to one of his analyses: Silica 55°40, Alumina 
S104, w ater 8-00; in another specimen he found 9°13 of water. Fre- 
Senius deduces the formula: 
41 Sit off —=Si 57-14, Al 31-72, H 1114100. 
Hone-slate or Novaculite—A very superior quality occurs on Carp 
River, Lake Superior Region (Foster & Whitney, loc. cit., p. 83). 
Zeolit -—The Pectolite found on the Isle of Skye at 
Storr, aforted Be Ad Scot t (Jameson’s Edinb. New Phil. J., liii, 
277) : 
ce Me Na i 
sor ioe tad 0396 7670 5-058=99-805 
Biving the oxygen ratio for the water, soda, lime, silica, 2 : 1:4: 12, 
Whence Dr. Scott deduces the formula, 
oo» Na Si+Cas Bit+-2Hi—siliea 526, lime 324, soda 9-1, water 59. 
