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rock butter. In DICTIOUS you will not only get to know all the dictionary meanings for the word
rock butter, but we will also tell you about its etymology, its characteristics and you will know how to say
rock butter in singular and plural. Everything you need to know about the word
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English
Noun
rock butter (uncountable)
- Native alum mixed with clay and iron oxide, usually in soft masses of a yellowish-white colour, occurring in cavities and fissures in argillaceous slate.