388 Intelli^etice and Miscellanies. 



*•& 



It is found in the hot spring of Oxhaver, in Iceland ; it 

 occurs in petrifactions, in which the wood has been re- 

 placed by calcareous spar, and more or less crystallized. — 

 Edinburgh Journal of Science. 



VI. Isopyre, described by Mr. Haidinger, designated, 

 from KJ05 (equal) and Ttvp (fire) in consequence of its resem- 

 blance to certain varieties of iron slag. It is said to have 

 the appearance of obsidian also, only the lustre is less bright 

 and glassy. It is found imbedded in a kind of granite in the 

 west of Cornwall. It is destitute of crystaline structure, pos- 

 sesses a conchoidal fracture, vitreous lustre, grayish black 

 and velvet black color occasionally dotted with red, and is 

 opake, or slightly translucent on the thinnest edges. Brit- 

 tle. Possesses a slight action on the magnetic needle. 

 Hardness =5*5 ... 6-0. Specific gravity =2.912. Itiscom- 

 posed of 



Silica 47-09 



Alumine 13-91 



Peroxide of Iron - - - 20-07 



' I.ime 15-43 



Peroxide of Copper - - - 1*94 



98-44 

 Philosophical Mag. and Annals of Philosophy. 



VII. Osmelite, described by Prof Breithaupt, of Frey- 

 berg. Its name is derived from oofiTj (smell) and ^tSoy 

 (stone.) Its color is grayish and yellowish white. It con- 

 sists of thin prismatic concretions, steilularly arranged ; high- 

 ly translucent, and greasy to the feel. Its hardness owing 

 to the fibrous structure is difficult to determine ; it appears 

 however intermediate between fluor and apatite. Sp. Gr. 

 =2-792 to 2-833. It gives out in the common temperature 

 of a room a clayey smell, which is increased by breathing on 

 it, or when brought from a warm to a cold place. In the 

 mouth it tastes like clay and appears as if it would dissolve 

 like clay, but no change takes place. 



It occurs superimposed on calcareous spar, mixed with 

 datholite in veins in trachyte, near Wolfstein, on the Rhine. 

 —Ibid. 



VIII. Hydrosilicite, described by Dr. Keh, is found at 

 Frankenberg, in Silesia in serpentine along with chryso- 

 prase, opal, and pemelite. It is white, without lustre, feels 

 greasy, translucent, fracture even, soft^ does not adhere to 



