rock butter

noun

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.

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Meanings

nounrock butter (uncountable)
  1. uncountableNative alum mixed with clay and iron oxide, usually in soft masses of a yellowish-white colour, occurring in cavities and fissures in argillaceous slate.
Cite this entry
APA

rock butter. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/rock%20butter

MLA

“rock butter.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/rock%20butter. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “rock butter,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/rock%20butter.

Source: rock butter on Wiktionary, CC BY-SA 4.0.