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The Learning Kingdom's Cool Word of the Day for August 5, 1999
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feldspar [FELD-spar]
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One of the most common minerals in the Earth's crust is feldspar, any
of several varieties of aluminum silicate with various other elements
mixed in. Feldspar is usually light colored, with flat surfaces
where it has broken (cleaved) along crystal planes.
German farmers plowing their fields used to turn up this light colored
mineral, often broken by the plow into flat-edged fragments. They
called this mineral feldspath, from feld- (field) and spath (spar, a
stone that cleaves). There are also other kinds of spar, including
"iceland spar" (a clear variety of calcite).
Today, the Old High German name for the mineral survives as a
technical adjective, feldspathic (relating to or containing feldspar).
Today's Cool Fact is about feldspar:
http://www.cool-fact.com/archive/1999/08/05.html
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