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The Adobe Flash Player is required in order to view this content. You can get it here: feldsparOne entry found. Main Entry: feld·spar Pronunciation: \ˈfel(d)-ˌspär\ Function: noun Etymology: modification of obsolete German Feldspath (now Feldspat), from German Feld field + obsolete German Spath (now Spat) spar Date: 1772 : any of a group of crystalline minerals that consist of aluminum silicates with either potassium, sodium, calcium, or barium and that are an essential constituent of nearly all crystalline rocks 
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