大海呈天青石色。

The sea was of a lapis lazuli blue.

《新英汉大辞典》

而天青石当时非常贵，而且难弄到。

Lapis Lazuli was very expensive and hard to get.

youdao

只见一条青石小径穿林而过。

Cutting through the woods was a bluestone path.

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青石地面上铺着软木垫。

There was cork matting on the stone floor.

youdao

龙甲村的青石小径。

A rustic path in Longjia village.

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认为本矿床应届沉积——改造类型的天青石矿床。

Therefore, the author considers the deposit to be a sedimentary-transform type of celestine.

youdao

认为本矿床应届沉积——改造类型的天青石矿床。

Therefore, the author considers the deposit to be a sedimentary-transform type of celestine.

youdao