26 OK HAUYNE-TEACHYTE AND ALLIED KOCKS. 



EXPLANATION OF PLATES. 



Fig. 1. — Section of trachyte showing zoned crystal of ortlioclase. 

 Mount Mary, &.W. Lovett. x nicols. x 16. 



Fig. 2.— Section ot melanite-trachyte with zoned crystal of 

 melanite-garnet. Cleary's Hill, N.W. of Lovett. Plain 

 hght. x"l6. 



Fig. 3. — Section of haliyne-aplite or haiiyne-trachyte dyke rock, 

 witli large Carlsbad twins of sanidine carrying included 

 crystals of haiiyne. Groundmass = crystals of green 

 augite and haiiyne with allotriomorphic ortlioclase fel- 

 spar. From Port Cygnet. X nicols. X 16. 



Fig. 4. — Section of trachyte from back road, two miles N.W. of 

 Lymington. Porphyritic crystals = sanidine in Carls- 

 bad twins and zoned, plagioclase, green hornblende and 

 augite. X nicols. x 16. 



Fig. .5. — Section of haiiyne-trachyte from Livingstone Hill, N.E. 

 of Lovett, showing large porphyritic sanidines. The 

 dark liexagon on the left represents melanite-garnet ; 

 the smaller crystal below it is green augite. Surround- 

 f ing these two crystals are small forms of haiiyne. 



X nicols. X 16. 



Fig. 6. — Section of green aegirine-trachyte from beach S. of 

 Lovett. Porphyritic sanidine and augite. Groundmass 

 = rods of pale green aeg^irine and prisms of sanidine 

 with fluxion structure. Plain light, x 16. 



Figs. 7 and 8. — Megasco^Dic photographs of dull tabular ortho- 

 clase (decomposed sanidine) crystals in haiiyne-trachyte 

 ^on Livino^sfone Hill, N.E. of Lovett. Natm-al size. 



