Rock butter

Rock butter (also known as stone butter) is a soft mineral substance found oozing from alum slates.

It consists of native alum mixed with clay and oxide of iron, usually in soft masses of a yellowish white colour, occurring in cavities and fissures in argillaceous slate.

单词	Rock butter
释义	Rock butter 英语百科 Rock butter Rock butter (also known as stone butter) is a soft mineral substance found oozing from alum slates. It consists of native alum mixed with clay and oxide of iron, usually in soft masses of a yellowish white colour, occurring in cavities and fissures in argillaceous slate.
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