Random triples
| Subject | Object |
|---|---|
| gptkb:Smoky_Quartz | Natural irradiation |
| gptkb:Smoky_Quartz | Aluminum impurities |
| gptkb:Smoky_quartz | Natural irradiation |
| gptkb:Smoky_quartz | Aluminum impurities |
| gptkb:smoky_quartz | natural irradiation |
| gptkb:smoky_quartz | aluminum impurities |
| gptkb:Amethyst | iron impurities and irradiation |