Assertion: fortification agate | /r/HasProperty | binghamite
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text: Other forms of agate include Holley blue agate (also spelled "Holly blue agate"), a rare dark blue ribbon agate only found near Holley, Oregon; Lake Superior agate; Carnelian agate (has reddish hues); Botswana agate; Plume agate; Condor agate; Tube agate containing visible flow channels or pinhole-sized "tubes"; Fortification agate with contrasting concentric banding reminiscent of defensive ditches and walls around ancient forts; Binghamite, a variety found only on the Cuyuna iron range (near Crosby) in Crow Wing County, Minnesota;