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.
Notes
References
- http://dict.die.net/rock%20butter/—has information from Webster's Revised Unabridged Dictionary (1913)
- Rock Butter, from the U.S. Bureau of Mines' Dictionary of Mining, Mineral, and Related Terms (1996), online at the Hacettepe University Department of Mining Engineering website.
- This article incorporates text from a publication now in the public domain: Wood, James, ed. (1907). "article name needed". The Nuttall Encyclopædia. London and New York: Frederick Warne.
- This article incorporates text from a work in the public domain: Porter, Noah, ed. (1913). "Webster's entry needed". Webster's Dictionary. Springfield, Massachusetts: C. & G. Merriam Co.
This article is issued from Wikipedia - version of the 6/12/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.