76 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
crystallised or large-foliated varieties of these three minerals must be admitted; 
but of the specimens in the succeeding table (p. 80) the followmg would, 
after mere ocular inspection, be set aside as one and the same. 
Scalpay, Bishop’s Hill, Fethaland, Ben Derag, Lude, Loch Laggan, and 
Girdleness; these—which include the three species—would be generally regarded 
as fine-grained massive chlorite. 
Craig-an-Lochan, Portsoy, and specimens from Vanlup, Hillswick, and Ben 
Laoigh, Argyll, would be regarded as large-grained foliated chlorite. 
Corrycharmaig, Cape Wrath, and Blair Athol—which include two species— 
would be considered to be all ripidolite. 
Again, Bishop’s Hill, Ben Derag, and Girdleness, may, as regards the amount 
of iron, be all regarded as aphrosiderites. 
As regards the amount of silica, alumina, and water, those ranked as 
chlorites seem to stand apart; but, in the other ingredients, the three seem so 
to run into one another, that the question arises whether one and the same 
substance be not trimorphic. 
The finest rosette crystallisations of chlorite I have found in Scotland 
occurred at Glen Effoch in Tarffside, in mica schist ; on the south-west slopes 
of Aonach Beg, Inverness-shire ; and, along with sphene and fluor in limestone, 
at “the three burns” south of Gaulrig in Glen Avon. JAMESON mentions its 
occurrence in fine crystals upon the road from Ardsin to the harbour of the 
Small Isles in Jura. 
CHLORITOID. 
1. This mineral is inserted here on account of its name expressing some rela- 
tion to those first considered, and also from its geognostic relationships being 
similar. I have also found passages in geological works in which “ chloritoidal 
schists” and “ chloritoidal rocks” were referred to, and I quite believe that the 
name was there employed under the supposition that the word was synonymous 
with chloritic. It is very probable that the mineral itself was quite unknown to 
the writers, the present notice being the first occasion on which it has been 
introduced as a British species. 
I obtained it some twenty years ago at Vanlup, Hillswickness, Shetland, 
imbedded in quartz veins, in close association with kyanite and margarodite. 
The including rock is a margarodite-schist, generally considered a talc-schist. 
The colour of the first specimen found was misleading as regards its nature, | 
being clove or chocolate brown, from a partial peroxidation of its iron. 
Its lustre was shining, slightly pearly. Streak greyish. Cleavage basal, 
perfect, but interrupted; parallel to two lateral planes, imperfect and rough. 
