352 



PROFESSOR HEDDLE ON 



white, and apparently dark green, from an intimate iutermixture of chlorite plates. 

 Occasionally a plate or two of talc occurs, and very rarely large and fine crystals of 

 chloritoid. These veins cut the huge beds of quartz which intercept the micaceous 

 strata of the promontory. The locality faces the picturesque sea-stacks of red porphyry 

 termed the Drongs. The crystals analysed were picked white, somewhat tinted with 

 pink. 



On 1*2 grammes- 









Silica 



•474 





from Alumina, . 



•022 



•496 = 38-153 





Alumina, 



. 56-979 





Ferric Oxide, 



. 1-867 





Manganous Oxide, . 



. -153 





Lime, .... 



. -301 





Water, . . . 



. 2-646 



Loses in the water -bath, '701 per cent. 

 Insoluble silica, 3-024 per cent. 



100-099 



From near Millden in TarfTside, Forfarshire. This occurs in large flat crystals of a 

 fine blue colour. 



I have found it at the following new localities in Shetland. Cliffhill, near Wood- 

 wick, and north-west of Norwick Bay in Unst. Magnetite and garnets are its associates 

 at the first of these localities ; it is in quartzose belts at the last ; the rock in both ci 

 being gneiss, and the colour of the mineral pale blue. At the south end of the Wark 

 of Skewsburgh, in the Mainland, associated with ilmenite in quartz veins in gneiss. It 

 is here greyish-white to blue. To the east of the same hill near its north end. 



Kyanite has more recently been found at the following localities : — 



In minute crystals of perfect transparency and deep blue colour along with green 

 hornblende and red garnet, forming the rock eklogite. This was found by Mr 

 Dudgeon, to the north-east of Obb, in Harris. 



Finely crystallised in the form of the figure and of a fine blue colour, at a height of 

 about 1100 feet, on the north-west slopes of Garlat Hill, Cowie Hill, Tarffside, by Mi- 

 Robert Murray. The matrix here was gneiss and the associate finely crystallised 

 chlorite. 



In interlacing grey crystals in gneiss far up in bed of the burn which comes from 

 the east into Glen Derry, Loch Callater, Aberdeenshire, by the Rev. Mr Peyton. 



In blue crystals in gneiss in Allt Beg, Glen Rinnies, by Mr James Wilson. 



In mica schist at a bridge over the Little Drumlach, in the parish of Enzie, Ba.nfl- 

 shire,* by Mr Wallace of Inverness. 



* Min. Mag., vol. vi. No. 28. But no description given. 







