24795
These signatures can be explained by the different chemical compositions of the crystal faces , and they reveal a remarkable binding specificity of the thiol group for the sulfur - rich { 100 } and { 110 } faces of the hexagonal and tetragonal forms , respectively .
 Chemical: sulfur
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: sulfur 
Answer:
 Chemical: sulfur