24 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
1°3 grammes yielded— 
Silica, . ; ’ : -468 
From Alumina, : * 006 
“Alt = 
Alumina, . 
Ferric Oxide, 
Ferrous Oxide, . 
Manganous Oxide, 
Lime, 
Magnesia, . 
Potash, 
Soda, . 
Water, 
Loss in bath, ‘325. 
36 * 461 
17 + 253 
4°18 
15 * 325 
*538 
689 
12°23 
9° 204 
657 
3° 385 
99 +922 
4. From Foinaven in Sutherland. The mineral occurs in bundles of inter- 
locking plates, imbedded in great veins, at a height of 750 feet, on the west slope 
of the hill. The associates are large crystals of orthoclase, and oligoclase. The 
Haughtonite is here jet black in colour, and of an extremely brilliant lustre. 
It seemed to be in hexagonal crystals. 
Its specific gravity is 3 ‘032. 
1-2 grammes yielded— 
Silica, , ; *428 
From Alumina, . °013 
Alumina, . 
Ferric Oxide, 
Ferrous Oxide, . 
Manganous Oxide, 
Lime, 
Magnesia, . 
Potash, 
Soda, 
Water, 
Loses ‘ 967 per cent. of water in the bath. 
extreme difficulty. 
5. From Rispond, Sutherlandshire. The 
36°75 
17° 858 
2°781 
15°175 
"416 
*933 
11°166 
9° 437 
1: 247 
4° 232 
go 999 
It is reduced to powder with 
mass of graphic granite which 
occurs in the gneiss at the north side of Rispond harbour has been described 
in Chap. IL. 
