68 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
This is situated on the grassy bank, only some few feet below where the 
conglomerate reposes in horizontal and peacefully rectilinear beds upon the 
denuded gneiss, which dips from the under surface of these beds almost at right 
angles thereto. 
The first of these erected beds to which interest attaches, carries hydrous 
anthophyllite, amianthus, and a jasper-like chert ; the second, which is some 
twenty yards to the south, contains a layer of ripidolite in close association 
with lavender-grey steatite and actynolitic hornblende. 
A year after our discovery of this mineral locality, the present writer found 
two other localities which lie in similar recesses among the rocks some little 
distance to the south. These contain the ripidolite in much larger quantity, 
but here its only associate is hornblende. 
This ripidolite forms belts in the rock, which consist of a mass of nearly 
parallel scales, of about the size of peas. They have a greasy lustre, and a 
blackish-green colour. Specific gravity, 2° 823. 
1-102 grammes yielded— 
Silica, , 5 Ook 
From Alumina, . RO 
342 = 31° 034 
Alumina, . : : . 14°845 
Ferric Oxide, . ‘ 2 ATO hae 
Ferrous Oxide, . J SATs ALT 
Manganous Oxide, . : ° 998 
Lime, : : : 4 [30D 
Magnesia, . : ; . 17°422 
Water, . ‘ ; . 12°481. 
100 - 292 
‘802 per cent. of the water were given off in the bath. Was apparently 
pure ; possible impurity, hornblende. 
4, Aphrosiderite.—I retain for the specimens now to be noticed the name 
assigned to them by Grec, as their high content of iron entitles them thereto. 
They occur in the chlorite-slate of the south-west of Scotland. An analysis 
probably of this variety from Bute by VARRENTRAPP is to be found in GREG 
and Lrerrsom’s “‘ Manual of Mineralogy.” It occurs in large masses along with 
guartz in the scars on the east side of the Bishop’s Hill above Dunoon. Here 
the structure is coarse and loose scaly, and the colour light green. Imbedded 
in quartz boulders which lie in the mouth of the stream (the Dirty Burn) which 
descends from these scars, the mineral is found in a brilliant dark-green minute 
