Rock butter
Template:Short description Template:Use dmy dates Script error: No such module "Unsubst".
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 colourTemplate:R with translucent edges,Template:R occurring in cavities and fissures in argillaceous slate.
This substance hardens when exposed to air, but softens if the air is humid enough.Template:R The texture is sometimes described as "greasy".Template:R
It was referred to as "rock butter" in English as early as 1816.Template:R
It has been recorded in various locations around the world, including Paisley, Scotland; Bornholm, Denmark; Bad Muskau in Germany; and along the Yenisey in Siberia.Template:R An 1837 article noted that at the "Kiffhäusen" stone quarries in Germany, the workmen called it Script error: No such module "Lang". and ate it spread on bread.Template:R
There have been reports of people eating rock butter in various parts of the world, including Siberia,Template:R Germany, and Austria.
See also
References
<templatestyles src="Reflist/styles.css" />
Cite error: <ref> tag with name "AJSA1830" defined in <references> is not used in prior text.
Cite error: <ref> tag with name "Jameson" defined in <references> is not used in prior text.
Cite error: <ref> tag with name "Murray" defined in <references> is not used in prior text.
<ref> tag with name "USMines1996" defined in <references> is not used in prior text.Script error: No such module "Check for unknown parameters".
- Pages with script errors
- Wikipedia articles incorporating text from the Nuttall Encyclopedia
- Wikipedia articles incorporating text from the 1913 Webster's Dictionary
- Wikipedia articles incorporating a citation from the 1913 Webster's Dictionary without a title parameter
- Pages with reference errors
- Pages with broken file links
- Minerals
- Clay minerals group