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We have distinguished two steps in the biomineralization process : the first , in which Fe is accumulated in the form of ferrihydrite , and the second , in which the magnetite is rapidly biomineralized from ferrihydrite .
 Chemical: Fe; Chemical: ferrihydrite; Chemical: magnetite; Chemical: ferrihydrite
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: Fe; Chemical: ferrihydrite; Chemical: magnetite; Chemical: ferrihydrite