bn:01796923n
Noun Concept
Categories: Mineral stubs, Minerals
EN
Rock butter  rock-butter  stone butter
EN
Rock butter is a soft mineral substance found oozing from alum slates. Wikipedia
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EN
Rock butter is a soft mineral substance found oozing from alum slates. Wikipedia
soft mineral substance found oozing from alum slates, consisting of alum, alumina and oxide of iron Wikidata
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. Wiktionary
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