A rounded mass of mineral matter found in sedimentary rock.

混凝土发现于沉积岩中的圆形矿石块.

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Mineral matter in coal is the primary cause for ash deposition in heating surface of boiler.

矿物质是引起锅炉受热面灰沉积的根本原因.

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The porphyry mass provided not only mineralizing hydrothermal solution but also a part of mineral matter.

斑岩体不仅提供成矿热液,也提供部分矿质.

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