It was made of black, glassy lava mixed with bits of feldspar.

它的成分为黑色的和坡璃质的火山石，同时大杂了长石。

Very likely, Professor Aronnax, because since 1866 eight little lava islets have surged up in front of the port of St. Nicolas on Palea Kameni.

那很可能，阿龙纳斯先生，因为，自18 66年以来，有八个火山石的小岛巴列亚～加孟宜小岛的圣尼古拉港对面浮来了。

Richard identified both as obsidian. " These are volcanic rock, " he said in his best encyclopedic voice. " But this isn't" . He kicked a washed-out stone and waved at the formation. " This is sediment" . Richard had a talent for scientific trivia.

理查德这两块石头都是黑曜石。" 这些是火山石，" 他用他那百科全书式无所不知的声音说，" 但这块不是，" 他用脚踢了踢一块褪色的石头，挥手指着那块岩层说：" 这是沉积物。" 理查德有研究科学冷知识的天赋。

This soft volcanic stone called tufa.

这种被称为图фа的柔软火山石。