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fortification The technical term for stripes of color in chalcedony.
Fortification AGATE
Norman's Law, Fife, Scotland.
Agate Types
Nearly all the generally accepted, descriptive agate forms or types are to be found in Scotland, including hemi-agate, sagenitic agate, onyx agate, moss agate, scenic agate...
However, there are many varieties of chalcedony crystal, each with its own particular properties- Agate, Bloodstone, Carnelian, Chrysoprase, Fire Agate, Fortification Agate, Flint, Jasper, Landscape Agate, Moss Agate, Onyx, Prase.
Installed in his bedroom that sported only one small inaccessible window was a wall safe surrounded by iron fortifications on the door outfitted with a lock possessing a secret mechanism only the Duke could operate.
Wyoming -- Wyoming's claim to fame is its fine-quality agates and petrified wood. Deposits across the State supply a variety of seam, moss, banded, fortification, and turritella agates.
 See also: Stone, Surface, Cut, Color, Inclusion
  
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