Iviii APPENDIX. 



XVII. rOKPHYIJY. 



— 1. ComiDact feldspar, Newbury. 

 — 2. Compact feldspar, Newbury. 

 ^ 3. Compact feldspar with talc, Newbury. 



— 4. Compact feldspar with dendrite, Medford. 



— 5. Compact feldspar witb quartz, Natick. 



■^ 0. Compact foliated feldspar, vein in sienite, Whatcly. 

 ~ 7. Compact brecciated feldspar, Dorchester. 

 8. Compact brecciated feldspar, Blue Hills. 

 — 9. Compact feldspar, rein in black serpentine, Newbury. 

 ••^.0. Conjpact feldspar, vein in black serpentine, Naliant. 

 ~~11. Compact feldspar, Hingliam. 

 **] -'. Compact feldspar, Lynn. 

 "\o. Compact feldspar, foliated, Natick. 

 ■~14. Compact feldspar, lime quarry, Stonebam. 

 —•15. Variegated compact feldspar, Medford. 

 -«.16. Compact feldspar passing into siliceous slat:, Maiden. , 



•"•17. Compact feldspar, siliceous, auriferous, Blue Hills. 

 *"^18. Red compact feldspar, passing into porphyry, Blue Hills. 

 19. Compact feldspar, passing into porphyr}', Hingham. 



— 20. Compact feldspar passing into porphyry, ^Milton. 

 "" 21. Compact feldspar passing into porphyry, Rowley. 

 "" 22. Compact feldspar passing into porphyry, Ipswich. 



23. Compact feldspar passing into porphyry, mctamorpliic, Kent's Island, 

 Newbury. 



— 24. Variegated compact feldspar, Dedham. 



—25. Porj^hyry approaching sienite, (polished,) ]\Ialdon. 



— 2G. Porphyry with traces of a slaty structure, Nantasket Beach. 



27. Porphyry, base purple, (polished, boulder.) Orleans. 



28. Porphyry, base black, Nantasket Beach. 



•*■ 29. Porphyry, near to amygdaloid, Westborough. 

 ~ 30. Between greenstone and porphyry, Ipswich. 

 • — 31. Between porphyry and compact feldspar, Milton. 

 -^32. Porphyry, Blue Hills. 



— 33. Porphyry, dark gray, (polished,) Blue Hills. 



34. Porphyry, dark gray, (polished,) north of Boston. 

 ^ 35. Porphyry, containing quartz nodules, (polished,) Milton. 

 3G. Light gray porphyry with quartz nodules, Milton. 



— 37. Porphyry, reddish, Nantasket Beach. 

 -- 38. Porphyry, (?) Newton. 



— 39. Porphyry, (?) with quartz and feldspar, ililtoa. 

 "^ 40. Porphyry, red and green. Maiden. 



--41. Red porphyry with quartz and feldspar, (boulder,) Newport, Rbode 

 Island. 



— 42. Red porphyry. Maiden. 



— 43. Red porphyry, Lynn. 



— 44. Porphyry, with red base, Nantasket Beach. 



