Random triples
| Subject | Object |
|---|---|
| gptkb:Prasiolite | Brittle |
| gptkb:mineral_zircon | brittle |
| gptkb:Jeremejevite | Brittle |
| gptkb:Citrine | Brittle |
| gptkb:chromite | brittle |
| gptkb:Agate_(mineral) | brittle |
| gptkb:Ca2(Mg,Fe)5Si8O22(OH)2_(nephrite) | tough |
| gptkb:segnitite | brittle |
| gptkb:thomsonite-Ca | brittle |
| gptkb:lonsdaleite | brittle |
| gptkb:Danburite | brittle |
| gptkb:Cordierite | brittle |
| gptkb:kaolinite | brittle |
| gptkb:rhodochrosite | brittle |
| gptkb:Montmorillonite | gptkb:plastic |
| gptkb:richterite | brittle |
| gptkb:albite | brittle |
| gptkb:Vanadinite | brittle |
| gptkb:Berzelianite | sectile |
| gptkb:smoky_quartz | brittle |