It's just these hard dolerite balls that they find in the eastern desert, which is just a stone that's harder than granite.

他们发现的东部的那些坚硬的辉绿球，这种石头比还要硬。

The site was once a quarry used to extract the Whin Sill dolerite rock  which was used to construct Hadrian's Wall in this area.

该地点曾一个采石场，用于开采用于建造这一区域的哈德良长城的辉绿（Whin Sill）。

Granite was used for all the pyramid's support beams. Much stronger than limestone, but extremely difficult to shape, workers used dolerite rocks as hammers to slowly quarry the stone.

用于金字塔的所有支撑梁。 比石灰石坚固得多，但极难成型， 工人们使用玄武作为锤子慢慢开采石头。