D.—No. 14,

TABLE IV. TABLE showing COMPOSITION of the principle variety of ROCK SPECIMENS passed through in the LYTTELTON and CHRISTCHURCH TUNNEL. N.B.—The numbers refer to the exact position from which each specimen was taken, as depicted on a sectional plan furnished by Dr. Haast, and exhibited in the Museum with the Specimens.

18

ANNUAL REPORT ON THE

No. Name. Specific Gravity. Silica. Alumina. Iron. Manganese. Lime. Magnesia. Potash. Soda. Loss by Ignition. Remarks. ISO 218 234 29b. 29a. 227 Trachyte Porphyry, with Iron stains in cavities ... Porphyritic Clay-stone, Porphyry or Phonolite ... Scoriaeeous Trachyte Trachyte Porphyritic Trachyte Fcrrocalciferous Phonolite 2-374 2-453 2-507 2-590 2-374 2-303 65-57 6215 61-99 61-38 60-69 54-18 15-67 22-11 13-08 20-60 17-75 19-25 5-98 5-37 8-65 2-57 383 8-99 Traces 1-20 4-42 1-19 1-21 3T6 2-88 1-20 2-21 2-18 1-20 313 Traces ■40 Traces •40 1-43 2-07 9-28 6-38 1-61 4-22 '28 638 4-22 9-70 1310 3-98 •62 1-19 382 1-98 •79 1-47 9-70 Traces 1310 3-77 | 3-98 (10-35) Soda with a small proportion of Potash. (5-69) Soda with Potash traces. 55 44 183 Porphyritic Basalt Trachydolerite Amygdaloidal Clay-stone 2-608 2-724 2-352 53-55 53-48 53-47 13-79 17-69 1635 15-41 14-23 9-23 Traces Traces 3-45 691 3-65 2-64 ■20 1-73 10-35 569 4-42 1 5-77 11-79 •81 1-80 5-38 196 7 28 Porphyritic Dolerite Clay-stone Trachydolerite 2-797 2-568 2-729 53-03 50-38 49-85 1801 28-27 15-75 5" 18 I Traces Traces 7-24 8-46 7-57 310 1-35 4T9 1-65 1-73 4-00 (5'18) Iron with a little Manganese. 1-73 8-39 8-08 •41 9-84 23 Altered Clay-slate 2-120 48-35 24-15 1079 4i -87 l •91 4'42 6-51 (10'79) Iron with traces of Manganese Oxides. (4-87) Lime with Magnesia traces. (16'60) Iron with a little Manganese. 191a. 10 Vesicular Dolerite "... Vesicular Clay-stone, Fcrrocalciferous ... 2-314 2-723 47-24 46-79 14-23 17.46 16-60 15-52 2-20 7-71 733 3-16 3-17 1-97 2-37 •44 5-05 6-72 2-02 51a. Bole 2-089 44-78 15-66 16-87 0-60 2-02 5-02 .69 12-36 Decomposed bt Hot Acids. Water. :i8 29a. 28 29b. 10 Porphyritic Clay-stone, Porphyry or Phonolite ... Porphyritic Trachyte Trachydolerite Trachyte Vesicular Clay-stone (Ferrocalciferous) 2-453 2-374 2-129 2-590 2723 52-78 44-41 39-99 37-15 28-95 12-34 1110 19-99 25-63 9-67 16-87 19-53 17-69 6-41 37-94 414 Traces 511 7-59 7-87 6-95 6-32 7-70 415 Traces 1-39 2-86 Traces 4-84 114 3-40 693 1-16 5-18 674 5'55 10-85 12-82 6-84 (4-84) With Alkaline traces. EXDECOHPOSED BT HOT ACIDS. 29b. 118 28 29a. 10 Trachyte Porphyritic Clay-stone, Porphyry or Phonolite ... Trachydolerito Porphyritic Trachyte Vesicular Clay-stone (Ferrocalciferous) 2-590 2-453 2129 2-374 2723 65-81 64-16 63-98 63-39 54-18 19-68 24-20 10-75 18-85 20-70 1-87 2-90 2-42 1-23 620 •47 1-46 Traces •72 1-17 6-73 •25 8-67 •48 •26 4-03 1-43 2-48 10-52 7-02 12-09 14-13 7-15 ;62 (2.48) With Alkaline traces.