Feldspath



  • A name given to a group of minerals, closely related in
    crystalline form, and all silicates of alumina with either potash,
    soda, lime, or, in one case, baryta. They occur in crystals and
    crystalline masses, vitreous in luster, and breaking rather easily in
    two directions at right angles to each other, or nearly so. The colors
    are usually white or nearly white, flesh-red, bluish, or greenish.


 

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