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We observed that the resultant magnetite / hydroxyapatite composites possessed a homogeneous dispersion of magnetite nanoparticles , characterized by an absence of large aggregates .
 Chemical: magnetite; Chemical: hydroxyapatite; Chemical: magnetite
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: magnetite; Chemical: hydroxyapatite; Chemical: magnetite