17035
Here , we report that Kawazulite , a mineral with the approximate composition Bi2 ( Te , Se ) 2 ( Se , S ) , represents a naturally occurring topological insulator whose electronic properties compete well with those of its synthetic counterparts .
 Chemical: Kawazulite; Chemical: Bi2 ( Te , Se ) 2 ( Se , S )
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: Kawazulite; Chemical: Bi2 ( Te , Se ) 2 ( Se , S )