Vol. 70.] OF THE COUNTRY AROUND HUSTLY. 271 



Mention must be made of a highly-foliated rock occurring near 

 Gibstone, and unlike any other hitherto described in this portion of 

 the area. It consists in the main of quartz, augite, biotite, and 

 andesine, but exhibits well-marked mortel-struktur in section 

 and foliation in the hand-specimen. Near Craigwillie there is a 

 small patch of a dioritic type, not unlike the above, but it is not 

 foliated. 



(#i) The hypabyssal rocks. — As had been expected, many 

 dykes, mainly pegmatitic, occur in the neighbourhood of the 

 Carvichen and Avochie granite-masses. These are well seen in 

 the quarries at Battlehill, and in the railway-cutting near Boghead 

 of Kinnoir. At Ladysmith the veinsj from the Avochie mass 

 effect considerable metamorphism. 



Basic dykes are mainly seen in the cutting at Rothieniay Station, 

 where many are found to be much decomposed. A gabbro- 

 pegmatite occurs near the Mission Kirk of Kinnoir, and a norite- 

 pegmatite cuts the basic rock in the quarry near Broadland. 



From the central intrusion, dykes are found traversing and 

 altering the norite in the quarries at Haddoch. A pegmatite 

 there is peculiarly rich in tourmaline, which occurs in crystals of 

 considerable size, usually of triangular cross -section. Fairly often 

 the crystals are terminated by rhombohedral faces. 1 



] iThe following results of the examination of tourmaline-crystals from a 

 vein in the quarry at Haddoch may be recorded here : — 



Simple large crystals. 



Prism zone : — 



In oscillation. 



a (1120) 

 m (1010) J 

 Termination : — 

 d (5052). 

 9 (10l2). 

 z (0111). 



Parallel growths. 



As above in each individual. 



Hemimorphic crystals. 

 Prism zone : — 

 a (1120) 



In oscillation. 

 m (1010) 



Terminations : — 



r (1011) 



y at -f- c termination. 

 e (0112) 



#•(1011) at — c termination. 



In all cases m is more strongly developed than a, and the resulting cross- 

 section is triangular. 



