| http://www.w3.org/ns/prov#value | - In another embodiment, the halloysite microtubules and platelets are first coated with a magnetic material such as iron or nickel, or the alloys nickel-boron, nickel-phosphorous, nickel-iron-phosphorous, and cobalt-boron as is disclosed at column 18, lines 38-41 of the aforementioned U.S. Pat. No. 5,492,696 of Price et al.
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