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be made of basalt
basalt 通常作不可数名词；be made of 强调材料可见且性质未变。
The ancient bridge was made of basalt columns.
这座古桥是用玄武岩石柱建造的。
玄武岩
先理解核心含义，再看它在真实句子里的用法。
玄武岩
the most common type of solidified lava; a dense, dark grey, fine-grained igneous rock
The ancient bridge was made of basalt columns.
这座古桥是用玄武岩石柱建造的。
一种坚硬的镁铁质火成岩,矿物成分多样,源于火山,构成了地球海洋地壳的大部分。
A hard mafic igneous rock of varied mineral content; volcanic in origin, which makes up much of the Earth's oceanic crust.
最常见的固化熔岩类型；一种主要由斜长石长石和辉石组成的致密深灰色细粒火成岩
the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene
一种无釉陶器。
A type of unglazed pottery.
The road was built with crushed basalt, which made it very durable.
这条路是用碎玄武岩铺成的，非常耐用。
Geologists found a thick layer of basalt beneath the old volcano.
地质学家在古老火山下方发现了一层厚厚的玄武岩。
These dark basalts formed when lava cooled quickly millions of years ago.
这些深色玄武岩是数百万年前岩浆快速冷却时形成的。
basalt 通常作不可数名词；be made of 强调材料可见且性质未变。
The ancient bridge was made of basalt columns.
这座古桥是用玄武岩石柱建造的。
表示“一块”等数量时，不可数名词需借助量词短语。
He picked up a piece of basalt from the ground.
他从地上捡起一块玄武岩。
复数形式 basalts 常用于地质学，指不同种类或地区的玄武岩。
The basalts of the valley are over 200 million years old.
该山谷中的玄武岩已有两亿多年历史。
Not this
The basalt is an igneous rock.
Use this
Basalt is an igneous rock.
当句子是在给玄武岩下定义或泛指这种岩石时，basalt 前不加定冠词 the；the 会使其变成特指某一块或某处的玄武岩。
Not this
The cliff is made of basalts.
Use this
The cliff is made of basalt.
basalt 作材料名词时是不可数名词，不能用复数；basalts 只表示不同的玄武岩种类，不能说 made of basalts。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
玄武岩柱；柱状玄武岩
The path runs between tall basalt columns.
这条小路在高大的玄武岩柱间蜿蜒。
玄武岩悬崖
Sea birds nest on the basalt cliffs.
海鸟在玄武岩悬崖上筑巢。
玄武岩纤维
Basalt fiber is used to reinforce building materials.
玄武岩纤维用来增强建筑材料。
玄武岩熔岩
The volcano erupted basalt lava.
这座火山喷发出了玄武岩熔岩。
熔融玄武岩
Molten basalt cools quickly in water.
熔融玄武岩在水中冷却得很快。
黑色玄武岩
The floor is made of polished black basalt.
地板是由抛光的黑色玄武岩制成的。
Use basalt naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
basalt 音似“巴索特”，想象火山口旁那块黑灰色的“巴索特”巨石就是玄武岩。
语域：neutral 常见场景：地质学、科普读物、科学课堂 该词是玄武岩的常用名称，通常在地质学教材、科普文章或课堂讲解中出现；虽然带有专业色彩，但本身没有明显的正式或非正式之分，日常对话中也可以使用。
通常作不可数名词；表示不同种类的岩石时，可用复数形式 basalts。
Dictionary facts from ECDICT, WIKTIONARY.