11568
Like other alkali - metal pyroxenes with S > ( 1 ) / ( 2 ) , NaMnGe ( 2 ) O ( 6 ) ( S = 2 ) was found to undergo a long - range antiferromagnetic ( AF ) ordering at T ( N ) = 7 K due to intrachain and interchain exchange interactions .
 Chemical: pyroxenes; Chemical: NaMnGe ( 2 ) O ( 6 )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: pyroxenes; Chemical: NaMnGe ( 2 ) O ( 6 )