PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 69 
scaly form. It is here associated with wad and pyrite. Its specific gravity is 
2° 959. 
1-381 grammes yielded— 
Silica, E ; *AT5 
From Alumina, . °014 
*489 = 35 * 409 
Alumina, . : : t 1S08% 
Ferric Oxide, . : : *484 
Ferrous Oxide, . : . 26°466 
Manganous Oxide, . : 608 
Lime, : : oo.) Bots 
Magnesia, . ‘ : 6 SN 76T 
Potash, . : : ‘ “O77 
Soda, é : ; ; "522 
Water, . , : » e026 
100° 355 
The silica here is large in amount. In other respects the analysis is similar 
to that of the aphrosiderite from Bonschener analysed by ERLENMEYER. It is 
possible that in several of these minutely foliated chlorites there may be inter- 
stitial quartz, but it is not probable that it would have escaped notice in the 
grinding in the smooth agate mortar. 
CHLORITE. 
From Micaceous Gneiss. 
1. The first occurrence I notice was in a serpentinous series of beds, which 
are interstratified with the gneiss of the north point of the Mainland of Shet- 
land; this point is called Fethaland. 
At a small bight termed Pundy Geo there is a bed of massive chlorite of a 
fine colour, which carries large crystals of magnetite. In association with this 
there is a picrolitic bed. The gneiss here being almost destitute of felspar, has 
- much of the character of mica slate. 
