440 Scientific Intelligence. 
It is in compact fibrous paaeees; of silky lustre, and is exceedingly 
tough. G,=2'784. BB. fuses to a bead without intumescence. I 
tially soluble in hydrochloric acid with the aid of heat, viscid flakes of 
— separating. 
olecite occurs in greenstone in long “sore needles, on the island 
of Mull. Composition according to Dr. Sco 
Si Al lime Hf 
46214 27-00 13°450 13°780=100°444 
corresponding to the formula of Scolecite. 
Natrolite is found at Bishoptown, Renfrewshire, in pure acicular 
crystals, 2 inches long, “interlaced into a felty mass,” associated with 
mesolite in ong radiated needles, and calc spar. Composition, accord- 
ing to Dr. S 
Si Al N H 
47-626 27-170 15124 9°780=99°700 
The Laumonite of sad in Skye, afforded Dr. Scott: 
Si Ca 
53048 a 943 9676 14:639==100°306 
It is associated with stilbite. me same mineral from Snizort in 
Skye, has been analyzed by Conne 
Leonhardite of Copper Falls, Lake Superior Region.—Messrs. Fos- 
TER and Wuirtney (loc. cit., 104) g ive the following analyses of a 
mineral which resembles S aanibulle. bt remains unaltered: they were 
made by Mr. G. O. Barnes, under the direction of Mr. Whitney : 
Si Al Ca H 
55°96 21:04 10°49 os 1:98=99°42 
55:04 22°34 10°64 . 11°98==99'95 
Algerite.—After an examination of many specimens of this mineral 
in different cabihets, and especially a fine suite in the collection of 
Mr. Wm. S. Vaux, I am satisfied that the form of the crystals is a 
square prism. In external appearance, they would not be distinguished 
— top a and this naturally suggests some relation to that spec! ies. 
Feld of o Granite of the Lake Superi ior Region.—Messts- 
“he ett rd Whit edu cit.) give the following results of an analysis 
is 0 
Si AldlittlePe Ca K Na H 
6670 1868 = 030 957 85S 0°70=99'53 
Oxygen, 3466 = 8 64 2.68 0°62 
Um ite ech ie ligoclans J. Lawrence Suita and G. J. 
Brusu. This vol., 
On Petalite and eae: C. iste This vol., p- 277- 
Spodumene and Petalite are reviewed by R. Hermann (ibid., Pe 276) 
mene, 
and varidhs species ‘efe rred to the same types. 5; ape 
and — are considered as belonging to he spodunens fil 
in crystallization. 
and not to the pyroxene family, although so near 
CS 
