Prehnite

 Mohs scale
  6.0 - 6.5
 Specific Gravity
  2.80 - 2.95
 Refractive Index
  1.611 - 1.673
 Crystal system
  Orthorhombic
 Chemical Composition
  Ca2Al2Si3O10(OH)2
 Sign of Zodiac (Click on the constellation for more information)
  Libra
 Chakra (Click on the chakra for more information)
  Heart Chakra
 Birthstones (Click on the month for more information)
  None
 
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