Cordierite

 Mohs scale
  7.0 - 7.5
 Specific Gravity
  2.56 - 2.66
 Refractive Index
  1.542 - 1.578
 Crystal system
  Orthorhombic
 Chemical Composition
  Mg2Al4Si5O18
 
 
 Sign of Zodiac (Click on the constellation for more information)
 Chakra (Click on the chakra for more information)
 Birthstone (Click on the month for more information)
  None
 


 
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