| Veins of quartz, tourmaline and chlorite may traverse the granite, containing tinstone often in workable quantities. |
| The younger granites form rugged hills of Jurassic age, and contain tinstone and columbite. |
| These oxides are commonly met with in samples of wolfram and tinstone, especially niobic. |
| The procedures needed to separate the tinstone from the other minerals are demanding. |
| Furthermore, the addition of the tinstone reduced the temperature required to melt the metal and, once melted, the bronze was more fluid and easier to cast. |
| Tin is found in nature chiefly as the oxide, called cassiterite or tinstone. |
