Feldspar is one of the most common minerals, and is found throughout the world. Most US production seems to be in New England.
There is a good discussion of the varieties, properties and sources of feldspar at
http://www.ozarkrockexchange.com/ore_features/2003/feldspar.shtml
Where is Feldspar found?
2 answers
From Wikipedia, about 7/8 down from the top, is this reference.
"Feldspar is an ingredient in Bon Ami US brand household cleaner.
In 2005, Italy was the top producer of feldspar with almost one-fifth world share followed by Turkey, China and Thailand, reports the International Monetary Fund."
http://en.wikipedia.org/wiki/Feldspar
"Feldspar is an ingredient in Bon Ami US brand household cleaner.
In 2005, Italy was the top producer of feldspar with almost one-fifth world share followed by Turkey, China and Thailand, reports the International Monetary Fund."
http://en.wikipedia.org/wiki/Feldspar