es 

316 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
1-528 grammes yielded— 
Silica, : : O00 
From Alumina, . .. °014 
Beats) = 35°99 
Alumina, . : : i Pet ed 
Ferric Oxide, : : 2 wonibeo 
Ferrous Oxide, . : 3 Zot ay 
Manganous Oxide, : 1 ove 
Lime, . 3 5 , : °403 
Magnesia, . : : ; “471 
Water, . : ; : : * 249 
100-482 
Insoluble silica, 7° 211; possible impurity, quartz. 
10. Of the brownish tinted larger variety one crystal was seen over five 
inches in diameter. 
On 1°3 grammes— 
Silipase as ‘ . *459 
From Alumina, . ga ge UL: 
*469 = 36 +076 
Alumina, . ; ‘ . 18-957 
Ferric Oxide, . : ~. 17083 
Ferrous Oxide, ; « 2E°b6 
Manganous Oxide, . . 13615 
Lime, . ; , : - 904 
Magnesia, : : eed arc) 
Water, . : ; : * 325 
100 : 239 

11. From the Blackwater, Loch Garve. 
Immediately to the south of the outflow of Loch Garve into the Blackwater, 
two large granitic veins occur; these carry well-crystallized plates of greenish 
mica, and large red-brown garnets, in rhombic dodecahedral crystals. | 
These yielded in 1°3 grammes— 
Silica, , : . ° 405 
From Alumina, OT 
‘47 ss 36° 153 
Alumina, . ; ; a 25 935 
Ferric Oxide, . ; Peas) 52a bs 
Ferrous Oxide, . ; 2 Loess 
Manganous Oxide, 7° 846 
Lime, 2 06w 
Magnesia, : JENS 
Water, . E : "OL 

100-161 
