Rock butter
From Infogalactic: the planetary knowledge core
File:Butter Stone - geograph.org.uk - 733677.jpg
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.
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: Lua error in package.lua at line 80: module 'strict' not found.
This article incorporates text from this source, which is in the public domain: Lua error in package.lua at line 80: module 'strict' not found.
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