PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 249 
All three possibly contained traces of coccolite. The Prehnite pseudomorphs 
were set round with a sheath of minute crystals of that substance. No trace 
was visible to the lens, however. 
4, From Crathie. 
The stratum of lime which has been worked in the hill face opposite to 
Crathie is doubtless the same as that at Delnabo ; it may be traced from Crathie 
for a couple of miles in a northward direction. The crystals of andesine are here 
neither so common nor so fine; nor have we here the transition into Prehnite, 
though Prehnite does occur in the quarry : there is here also altogether a feebler 
development of mineral formation, and of exceptional metamorphism. 
_ A singular rock is, however, the cap of the limestone; at a small distance it 
has somewhat the appearance of a black porphyry, and it is porphyritic in 
structure. 
When examined with the lens it shows a basis composed solely of minute 
brilliant crystals of brown augite, somewhat translucent—(“ pseudo-hypers- 
thene.”) Among these there lie porphyritically imbedded pale-blue hyaline 
erystals, which I believe to be andesine, but which may be labradorite; very 
rarely a spangle of Biotite may be seen, but nought else. 
The andesine was here immediately associated with Wollastonite and 
coccolite ; it was not striated; its cleavage angle was 86° 24’: its specific 
gravity, 2° 677. 
The first analysis was incomplete through an accident. The second was on 
1299 grammes, which yielded-—silica -712; from the alumina, ‘ 015=- 727. 

Average. 
Silica, . . : 56:64 55 °996 56: 303 
. Alumina, a at * 25-706 25-706 
Ferric Oxide, . 3 La -967 967 
Protoxide of Manganese, _... tr. tr. 
Lime, ' Bee 9° 354 9-354 
Potash, . ; : 1:462 1°514 1°488 
Soda, : 5 : 4°89 4°557 4724 
Water, . f : 1°611 2° 024 He Silh7, 
100 ‘088 100° 359 
The insoluble silica in the second was 2° 063 per cent. ; possible impurity, 
| Wollastonite or quartz. 

From Diabase, near Limestone. 
5. The rock immediately on the east side of the harbour of Portsoy, in 
Banffshire, first got the name of “primitive greenstone,” and then “ syenitic 
VOL, XXVIII. PART I. oT 
