Table 4 Interface types results from a point counting of 100 grains from very coarse (1–2 mm), coarse (1–0.5 mm) and medium (0.5–0.25 mm) grain size fractions from Stromboli sand samples (STR = Stromboli Island; STR-9 = crater sand. Vc = very coarse, C = coarse, m = medium)
From: The use of mineral interfaces in sand-sized volcanic rock fragments to infer mechanical durability
Interface type | STR-1-Vc | STR-1-C | STR-1-m | STR-9-Vc | STR-9-C | STR-9-m | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
N. | % | N. | % | N. | % | N. | % | N. | % | N. | % | |
Op/Glgr | 0 | 0.00 | 6 | 0.29 | 0 | 0.00 | 21 | 0.65 | 0 | 0.00 | 10 | 0.70 |
Pl/Glgr | 2451 | 65.39 | 1274 | 61.52 | 756 | 53.88 | 1385 | 43.13 | 926 | 49.81 | 540 | 37.74 |
Px/Glgr | 441 | 11.77 | 195 | 9.42 | 131 | 9.34 | 325 | 10.12 | 187 | 10.06 | 143 | 9.99 |
Ol/Glgr | 299 | 7.98 | 190 | 9.17 | 203 | 14.47 | 332 | 10.34 | 240 | 12.91 | 269 | 18.80 |
Hbl/Glgr | 3 | 0.08 | 0 | 0.00 | 7 | 0.50 | 18 | 0.56 | 3 | 0.16 | 8 | 0.56 |
Idd/Glgr | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 8 | 0.25 | 3 | 0.16 | 4 | 0.28 |
Bt/Glgr | 0 | 0.00 | 0 | 0.00 | 2 | 0.14 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Rt/Glgr | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Pl/Migr | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Px/Migr | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Op/Migr | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Ol/Migr | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Hbl/Migr | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0.00 | 0.00 | 0 | 0.00 |
Rt/Migr | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Bt/Migr | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Op/Ol | 8 | 0.21 | 73 | 3.52 | 81 | 5.77 | 70 | 2.18 | 51 | 2.74 | 81 | 5.66 |
Px/Ol | 31 | 0.83 | 3 | 0.14 | 14 | 1.00 | 202 | 6.29 | 43 | 2.31 | 16 | 1.12 |
Pl/Ol | 11 | 0.29 | 13 | 0.63 | 19 | 1.35 | 116 | 3.61 | 30 | 1.61 | 18 | 1.26 |
Pl/Op | 12 | 0.32 | 3 | 0.14 | 0 | 0.00 | 6 | 0.19 | 36 | 1.94 | 56 | 3.91 |
Px/Op | 128 | 3.42 | 119 | 5.75 | 29 | 2.07 | 104 | 3.24 | 65 | 3.50 | 123 | 8.60 |
Pl/Px | 100 | 2.67 | 55 | 2.66 | 21 | 1.50 | 135 | 4.20 | 26 | 1.40 | 15 | 1.05 |
Ol/Idd | 0 | 0.00 | 2 | 0.10 | 0 | 0.00 | 19 | 0.59 | 19 | 1.02 | 4 | 0.28 |
Hbl/Pl | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Hbl/Px | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 5 | 0.16 | 2 | 0.11 | 4 | 0.28 |
Bt/Pl | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Bt/Px | 0 | 0.00 | 0 | 0.00 | 2 | 0.14 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Bt/Op | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Hbl/Op | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 8 | 0.56 |
Idd/Px | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Idd/Pl | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Ol/Bt | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Ol/Hbl | 0 | 0.00 | 0 | 0.00 | 12 | 0.86 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Bt/Hbl | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Pl/Pl | 190 | 5.07 | 114 | 5.50 | 103 | 7.34 | 343 | 10.68 | 192 | 10.33 | 98 | 6.85 |
Px/Px | 47 | 1.25 | 16 | 0.77 | 13 | 0.93 | 75 | 2.34 | 15 | 0.81 | 9 | 0.63 |
Ol/Ol | 27 | 0.72 | 8 | 0.39 | 10 | 0.71 | 47 | 1.46 | 21 | 1.13 | 25 | 1.75 |
Op/Op | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Hbl/Hbl | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
Bt/Bt | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 | 0 | 0.00 |
TOT | 3748 | 100 | 2071 | 100 | 1403 | 100 | 3211 | 100 | 1859 | 100 | 1431 | 100 |