PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 251 
In the neighbourhood true hypersthene, in foliated patches the size of peas, 
is very rarely found ;—but so far as I know only in loose blocks.* 
The cleavages of this andesine were too curved for measurement ; the 
specific gravity was 2° 692. 
1°62 grammes gave— 


















Silica, . : 3 : : : 58 ° 36 
Alumina, 3 7 . , : 23 ° 344 
Ferric Oxide, ; . ; é 24 
Magnesia, . : ; ; : 5 
Lime, . : ‘ 5; i : 8° 24 
Potash, ; 3 , ‘ ; ho koh 
eda, sts 3 ‘ f , 7° 844 
Water, . , : 2 : : 53 
100 * 209 
ANDESINE. 
| | | } 
Colour, eee’ Be | Si. | Al,0. | Fe,0. | Mu.| Mg. | Ca. Ky. Nao. Hy. Total. 
Glen Urquhart,......|White | 86° 28 | 2°672 || 58-38 | 22°5 |2:12 | -15 | tr. | 5:34 | 3-2 | 5-21 | 3-41 |100°31 
Glen Gairn, ......... Blue | 86°21 | 2°705 | 57°18 | 24:04 | 1-12 12 | 611 | 2°83 | 7:13 | 1°6 || 100713 
(=a White} ... | 2°689 || 56°96 | 23°81] -94 | ... | ‘09 | 7°98 | 2°56 | 6°85 | 1-62 |100°81 
Satie, .............. White | 86°24 | 2°677 || 56:3 25°71 | 97 | tr. |... | 9°85 |) 149 | 4-72 | 1-82 | 100°36 
Portsoy, ............. White}... | 2°692 || 58°36} 23-34| -24 |... | 5 | 8-24 |/D15 | 7°84 | -58 | 100-21 
LABRADORITE. 
From Gneissose and Serpentinous Rocks. 
1. Immediately to the west of the aphanite mentioned at page 250, as 
occurring near Portsoy, there is a tilted bed of euphotide rock, entirely con- 
verted in those portions which are above high water line into a mottled 
serpentine ; after passing over a quantity of debris from this rock, lying 
probably in the void of a washed-out lime stratum, a bed almost fifteen feet in 
thickness, of white or pale greenish-grey labradorite is seen; the workings of 
an old mine, said to have been Jead, runs along its west face; a stratum of 
taleaceous quartzite formed the west wall of the mine. 
* Somewhere near this spot, Mr Grizve of Burntisland found a loose piece of hypersthene, 
showing a cleavage face over an inch in extent. 

