PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 317 
Tnsoluble silica, 4:68 per cent.; possible impurity, mica. This garnet con- 
tains but half the quantity of the manganese present in the others. 
12. From the tilted granitic belt already noticed, in my chapter on the 
Felspars, as occurring near Struay Bridge, Ross-shire. 
The crystals of garnet are in the leucitic form, of about an inch in size, and 
of a somewhat fine red; they are deficient in transparency, and much flawed. 
The associates have been before noted, with the oo of zircon, which I 
have lately found imbedded in the pink Helga 
1°304 grammes yielded— 
Silica, : f . +465 
From Alumina, et 
- 465 = 35 * 695 
Alumina, . : ‘ . 15:°804 
Ferric Oxide, : 3 » Yale 3084 
Ferrous Oxide, ‘ . 14°941 
Manganous Oxide, : . 11426 
Lime, . : , ; ee kG 
' Water, , : J f - 06 
100-09 
Possible impurity, quartz. 
13. From granitic belts on the north-east side of Ben Resipol in Argyllshire, 
hear the summit. The associates are cream-coloured opaque orthoclase, and 
muscovite. 
The garnets are of a fine lively red, transparent, and less fissured than usual 
in Scotland. 
On 1°3 grammes— 

Silica, . : 5 * 471 
From Alumina, . °008 
"479 = 36 * 846 
Alumina, . ; : Riga 
) _ Ferric Oxide, ; , - 4-381 
Ferrous Oxide, . ‘ . 18-378 
| Manganous Oxide, ‘ . 14-461 
Lime, . ‘ : ; ; e7TD 
Magnesia, . : ; * 846 
