152 Intelligence and Miscellaneous Articles. 



We may therefore consider it as composed of — 



Twelve eqs. of silica 16 X 12 = 192 44- 75 



Nine ... alumina 18 X 9 = 162 37*76 



One ... potash =48 11*20 



Three ... water 9x 3= 27 6'29 



429 100- 



Ann. de Ch. et de Phys., Octobre 1845. 



HYDRATED SILICATE OF MAGNESIA. BY M. A. DELESSE. 



This substance is arranged at the Ecole des Mines with the mi- 

 neral species which M. Breithaupt has named Kerolite, and it ap- 

 peared to M. Delesse to require examination. It comes from Ger- 

 many, its locality however is unknown ; but it has evidently occurred 

 in serpentine. 



Its colour is yellowish-white, it is opaline and slightly transpa- 

 rent ; its fracture resembles wax, and it is greasy to the touch ; it 

 is occasionally spotted with milk-white spots, which appear to be a 

 different substance. Its specific gravity is 2 , 335 ; when slightly 

 heated in a glass tube it becomes black and loses water ; when 

 strongly heated it becomes of a dead-white colour, and loses its 

 transparency. The black colour appears to be owing to bitumen, 

 for it disappears when the substance is strongly heated in a closed 

 tube ; this property belongs also to kerolite, mestaxite, saponite, &c. 



When put into water after calcination it emits a great number of 

 bubbles of gas, becomes hard, and is with difficulty acted upon 

 by acids ; whereas before heating it is scratched by calcspar and 

 easily acted upon ; it is completely infusible ; with the salt of phos- 

 phorus it gives a skeleton of silica. 



A qualitative analysis showed that this substance contains only 

 water, silica, magnesia, a little alumina and traces of iron, which ap- 

 pear to be in the state of peroxide, and disseminated in small veins 

 throughout the mass. 



By analysis this mineral gave — 



Silica 53'5 



Magnesia : 28*6 



Alumina and a trace of oxide of iron 00*9 



Water 16-4 



99-4 

 Annates des Mines, 1844. 



ANALYSIS OF THE ELIE PYROPE OR GARNET. 

 BY PROF. CONNELL. 



This mineral, which is known to amateur collectors under the 

 name of Elie ruby, is found on the sea shore at Elie, in the county 

 of Fife, proceeding from the debris of trap-rocks. It has been long 

 known to Scottish mineralogists, and has been regarded as one of 

 the varieties of precious garnet, and is occasionally called pyrope. 

 It is not crystallized, but occurs in angular grains, which evidently 



