Alum shale

Alum shale (also known as alum schist and alum slate) is a variety of black shale. It is shale or clay slate containing pyrite. Decomposition of pyrite by weathering forms sulfuric acid, which acts on potash and alumina constituents to form alum, which often occurs as efflorescences on the rock outcrop.

单词	Alum shale
释义	Alum shale 英语百科 Alum shale Alum shale (also known as alum schist and alum slate) is a variety of black shale. It is shale or clay slate containing pyrite. Decomposition of pyrite by weathering forms sulfuric acid, which acts on potash and alumina constituents to form alum, which often occurs as efflorescences on the rock outcrop.
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