Table 2 Melt history of each of the seven samples prepared for chemical durability testing.
Sample ID | Melt temperature (°C) | Melt time | Melt notes | General notes | Tests |
|---|---|---|---|---|---|
BA5 1250 °C | 1250 | 1 h | Purpose was to reproduce melt conditions and heterogeneity (presence of crystals) found in Broborg samples. Many inclusions of unmelted quartz. | PCT, VHT, EPA 1313 | |
BA5 1400 °C | 1400 | Two melts at 1 h each | Crushed to fine powder between melts | Some inclusions of quartz in the vitreous portion. | PCT, VHT |
Lab-made BA5 | 1400 (1st melt) 1450 (2nd melt) | Each melt at 1 h each | Crushed to fine powder between melts | Homogeneous sample. | PCT, VHT |
443 Granite 1250 °C | 1250 | 1 h | Purpose was to reproduce melt conditions and heterogeneity (presence of crystals) found in Broborg samples; glass only found in localized area; large quartz grains remain. | PCT, VHT | |
443 Granite 1400 °C | 1400 | Two melts at 1 h each | Crushed to fine powder between melts | Many inclusions of quartz throughout vitreous fraction. | PCT, VHT |
Lab-made Granite | 1400 (1st melt) 1450 (2nd melt) | Each melt at 1 h each | Crushed to fine powder between melts | Opacity caused by numerous micron-sized bubbles. Bubbles too small to remove from viscous melt. | PCT, VHT |
Dike | 1300 | 1.3 h | No unmelted particles observed by optical microscopy | Some crystalline material on a micrometer scale (Fig. S1). | VHT |
