Rock butter
From Wikipedia, the free encyclopedia
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.
[edit] 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 the public domain 1907 edition of The Nuttall Encyclopædia.
This article incorporates text from the public domain 1913 Webster's Dictionary.
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