Table 2. Results of elemental analyses obtained for several crystals of kaliophilite from Colle Cimino and Monte Somma.
x represents the number of points analyzed and used for averaging and y represents the number of analyzed grains. ‘Nd’ stands for not detected. Analyses of sample cc2 were performed on nanometric fragments using a transmission electron microscope and have a dispersion not comparable with other measurements.
| Sample | Colle Cimino cc1 | Colle Cimino cc2 | Colle Cimino cc3 | Pollena ms1 | Monte Somma ms2 |
|---|---|---|---|---|---|
| x, y | 3, 3 | 2, 1 | 30, 3 | 15, 1 | 30, 3 |
| K2O | 28.13 (14) | 26.04 | 29.41 (24) | 27.42 (23) | 28.17 (23) |
| Na2O | 0.98 (50) | 1.19 | 0.68 (8) | 2.03 (9) | 1.69 (10) |
| CaO | Nd | Nd | 0.00 | 0.01 (1) | 0.00 |
| Fe2O3 | 1.34 (15) | 1.36 | 0.04 (3)† | 0.04 (2) | 0.04 (3) |
| Al2O3 | 30.77 (48) | 32.28 | 32.20 (21) | 31.65 (49) | 32.63 (33) |
| SiO2 | 36.91 (76) | 39.13 | 38.93 (36) | 39.70 (30) | 38.55 (34) |
| Total | 98.13 | 100.00 | 101.26 | 100.78 | 101.08 |
| Elements, based on four oxygen atoms per formula unit | |||||
| K | 0.966 (5) | 0.88 | 0.973 (16) | 0.901 (8) | 0.931 (9) |
| Na | 0.051 (26) | 0.06 | 0.034 (12) | 0.102 (5) | 0.085 (5) |
| Ca | – | – | 0 | 0.02 | 0 |
| Fe | 0.027 (3) | 0.03 | 0.001 (1) | 0.001 (1) | 0.001 (1) |
| Al | 0.976 (15) | 1.00 | 0.984 (9) | 0.964 (10) | 0.996 (7) |
| Si | 0.993 (20) | 1.03 | 1.010 (8) | 1.026 (8) | 0.999 (6) |
†
FeO.