| ISH-G | Trachyte | Page Last Updated: |
| Saturday, December 04, 1999 |
| Page 1 of 3 |
| ________________________________________________________________________________ |
| Producer: | Groupe International de Travail "Etalons analytiques des mineraux, minerais et roches" |
| - International Working Group "Analytical Standards of Minerals, Ores and Rocks |
| Material Source: | Isle of Ischia, Gulf of Naples, Italy |
| Date Released: | 1992 |
| Production Ref: | 95GOV - 01 |
| _________________________________________________________________________________ |
| Constituent | Concentration | Uncertainty | Units | N | Data Quality | Data Source |
| _________________________________________________________________________________ |
| Major Oxides |
| Al2O3 | 18.6 | % | Provisional value | 95GOV - 01 |
| CaO | 3.5 | % | Provisional value | 95GOV - 01 |
| Fe2O3-T | 4.9 | % | Provisional value | 95GOV - 01 |
| K2O | 6.49 | % | Provisional value | 95GOV - 01 |
| MgO | 1.3 | % | Provisional value | 95GOV - 01 |
| MnO | 0.12 | % | Provisional value | 95GOV - 01 |
| Na2O | 5.14 | % | Provisional value | 95GOV - 01 |
| P2O5 | 0.32 | % | Provisional value | 95GOV - 01 |
| SiO2 | 58 | % | Provisional value | 95GOV - 01 |
| TiO2 | 0.8 | % | Provisional value | 95GOV - 01 |
| Minor Oxides |
| BaO | 0.073689 | % | Provisional value | 95GOV - 01 |
| Cr2O3 | 4.38465E-04 | % | Provisional value | 95GOV - 01 |
| Rb2O | 0.0306 | % | Provisional value | 95GOV - 01 |
| SrO | 4.080005E-02 | % | Provisional value | 95GOV - 01 |
| ZnO | 8.09094E-03 | % | Provisional value | 95GOV - 01 |
| ZrO2 | 0.04995 | % | Provisional value | 95GOV - 01 |