Table 1.
Semi-quantitative estimation of the mineralogical compositions of the Cuban (~ 3 µm) and Mexican (~ 20–150 µm) zeolites
| Zeolite | Mineralogical composition (%)a, b, c | ||||
|---|---|---|---|---|---|
| Clinoptilolite | Mordenite | Quartz | Anorthite | Unidentified or amorphous phases | |
| Cuban | 43 | 35 | – | – | 22 |
| Mexican | 65 | < 1 | < 1 | < 1 | 32 |
aMineralogical compositions were calculated using synthetic zeolites (clinoptilolite and mordenite) as external references
bThe phase contents of clinoptilolite and mordenite present in the Cuban and Mexican zeolites were estimated by calculating the ratio of the sum of the (integral) intensities of 8 most intense peaks to those of phase-pure synthetic counterparts
cThe following set of {hkl}(2θ°) values was considered for clinoptilolite: {020}(9.88), {200}(11.19), {111}(17.36), {131}(22.36), {240}(22.82), {− 222}(26.04), {− 422}(28.15) and {151}(30.05); and mordenite: {110}(6.51), {200}(9.77), {111}(13.45), {330}(19.61), {150}(22.20), {202}(25.63), {350}(26.25) and {511}(27.67)