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The Pamphlet Collection of Sir Robert Stout: Volume 67

Analyses of Volcanic Ash and Lapilli from the Tarawera Eruption.—By J. A. Pond, Colonial Analyst, Auckland

—Dust, Ash, or Mud. Lapilli. Okaro. Wairoa. Tauranga. Whakatane. Opotiki. Wairoa. Pareheru. Rotoehu. Soluble on heating in hydrochloric acid and water, equal quantities—1. 2. 3. 4. 5. 6. 7. 8. Silica .. .. .. .35 .20 .35 .65 .60 .50 .70 .50 Iron oxides .. .. 2.05 2.50 3.00 2.90 3.20 3.90 3.85 3.50 Alumina .. .. 3.45 2.80 5.01 4.45 3.90 3.70 4.95 6.60 Lime .. .. .. .95 .67 2.01 1.92 2.10 1.79 2.14 2.65 Magnesia .. .. .20 .30 .30 .47 .80 .67 .45 .70 Soda .. .. .. .33 .37 .58 .64 .59 .70 .84 .67 Potash .. .. .. .16 .19 .18 .17 .17 .14 .16 .09 Chlorine .. .. .05 .07 .03 .04 .06 .04 .05 .. Phosphoric acid .. .. .09 .09 .14 .095 .125 .10 .125 .06 Sulphuric acid .. .. .39 .32 .48 .35 .30 .22 .41 .. Carbonic oxide .. .. Traces Traces Traces Traces Traces Traces Traces Traces Organic matter .. .. 1.30 1.30 .90 .20 .25 .. .. .. Water .. .. .. .85 .90 .75 .30 .15 .. 25 .. Insoluble in acid— Silica .. .. .. 66.50 69.90 63.65 56.50 55.70 50.40 50.65 52.10 Iron oxides .. .. 4.00 2.65 4.20 8.65 8.30 10.20 10.65 9.20 Alumina .. .. 14.50 13.15 13.15 13.90 13.80 16.30 13.25 11.70 Lime .. .. .. 2.90 1.93 3.41 6.44 6.35 8.59 8.12 8.40 Magnesia .. .. Traces Traces 1.60 .90 1.40 2.10 2.65 3.95 97.07 97.34 99.74 98.57 97.795 99.415 99.245 100.12

Analyses of Volcanic Ash and Lapilli from the Tarawera Eruption.—By J. A. Pond, Colonial Analyst, Auckland.