28475
The term " iron mica " is sometimes used for iron-rich biotite , but the term also refers to a flaky micaceous form of haematite , and the field term Lepidomelane for unanalysed iron-rich Biotite avoids this ambiguity .
 Lepidomelane, Biotite
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lepidomelane, Biotite