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DIALLAGE ROCK, SERPENTINES, ETC. 



217 



o o 



Upper 

 GAlleey. 



. 32. — Diallage rock, from a vein traversing greenstone. 

 Coast near St. Keverne, Cornwall. 



33. — Diallage rock. Map 32. — Coverack, Lizard, Wall-case 5. 

 Cornwall. 



34.— Diallage rock, composed of crystals of diallage 

 disseminated in a base of serpentine ; used for ornamental 



purposes, chimney-pieces, &c. M 

 Cornwall," p. 499. — Cadgwith, Cornwall. 



See 



M 



Report on 



35 and 36. — Diallage rock. Map 78, N.W Ceryg- 

 moelion, Anglesea. 



37.— Green serpentine, with diallage. — Ceryg-moelion. 

 38. — Green serpentine, with white calc spar. Ceryg- 

 moelion, Anglesea. 



39. 



Light green serpentine. — Anglesea. 



40. — Green compact serpentinous rock. 

 moelion, Anglesea. 



Ceryg- 



41. 



•Light green serpentinous rock. 



Map 78, Kf, 



78, N.W 



•Llan 



■Near Four Mile Bridge, Anglesea. 

 42. — Compact serpentine rock. 

 fechell, Anglesea. 



43. — Green serpentine, with steatitic veins. — Llanfe- 

 chell, Anglesea. 



44. — Green serpentine, with apparently a schistose 

 structure. — Llanfechell, Anglesea. 



45. — Green serpentinous rock, with apparently a 

 schistose structure. 



An 



The schistose appearance of specimens 44 and 45 is 

 owing to the presence of minute steatitic veins, in the di- 

 rection of which the rock is most easily broken. 



46. — Green serpentinous marble, with numerous veins 

 of white calc spar. Map 78, N.W.— Ceryg-moelion, An- 



glesea, 



47. — Serpentinous rock ( 



Anglesea. 



Ceryg-moelion, 



48— Reddish serpentinous marble, with fragments of 

 slate and numerous veins and lines filled with white calc 

 spar. — Llanfechell, Anglesea. 



