THE MINERALOGY OF SCOTLAND. 



353 



By the writer it has been found — 



In small blue crystals in Hebridean gneiss on the hill to the west of Ben Chaipaval 

 in Harris. 



In quartzite near summit of Cam Lia, Ben y Gloe, Perthshire. 



In greyish-blue crystals, along with garnet, sphene, ilmenite, and chlorite, in mica 

 schist, one mile north of Loch Bulg in Aberdeenshire. 



In large blue-grey crystals, along with ilmenite and chlorite, in gneiss on the slopes 

 on the east side of the corry of Meall Buidh, on the south side of the Moor of 

 Rannoch. 



In gneiss in the railway cutting west of Mulben, Banffshire. 



In bright blue crystals in gneiss near limestone about one mile west of the lime- 

 stone quarries at Dulnan, Inverness-shire. 



Loose lying in grey and blue interlacing crystals on the south slopes of Cruach 

 Ardran, in Perthshire. 



In tufts of grey crystals impregnated with the substance of the rock in clay-slate, at 

 the lime quarries of the Burn of Aldernie, Banff. 



In large single imbedded blue crystals and fasciculitic tufts, a peculiar yellow mar- 

 garodite slate, south-east of the lime quarries in Glen Urquhart. # 



In quartzose veins in a clay slate which contains rosette groupings of actinolitic 

 crystals in the rocks, about three-quarters of a mile north-west of Sandend in Banff- 

 shire. The crystals of the mineral here, an inch or two in length, pass through portions 

 of both matrix and vein, after the manner of rivets, just as described by Macculloch 

 as occurring at Boharm. They appear to have issued from the matrix into the vein, as 

 if formed nearly contemporaneously with the filling of the latter with the quartz ; but 

 ,as the terminations are not distinct, this conclusion is drawn from the greater breadth 

 of the crystals, where they lie in the quartz, than in the schist. 



These crystals, like those at many other of the above localities, are in parts colour- 

 ess or pale yellow. 



In lenticular quartz nodules, often morion, and sometimes prase, with pyrite, in 

 shiastolite slate, west of the clay-slate quarry near Portsoy, sometimes colourless. 



This yielded on 1*3 grammes : — 





Silica, ..... 



37-53 



Alumina, .... 



58-105 



Ferric Oxide, .... 



2-089 



Lime, ..... 



•129 



Magnesia, .... 



•076 



Potash, . . . . 



•252 



Soda, ..... 



•741 



Water, ..... 



1-198 



100-12 



Its specific gravity was 3'016. 



