Chemical Formula: (Mn2+,Fe2+,Mg,Ca)SiO3 ,

 Mohs Scale : 5.5 - 6.5 

 Crystal System : Tricilinc

*Rhodonite is the official gemstone of the Commonwealth of Massachusetts. 

Chemical Formula : Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2 

Mohs Scale : 5-6

Crystal System : Monoclinic

  Chemical Formula : MgCaSi2O6 

  Mohs Scale : 5.5 - 6.5

  Crystal System : Monoclinic

  Chemical Formula : Ca2(Mg,Fe)5Si8O22(OH)2 

  Mohs Scale : 6 - 6.5

  Crystal System : Monoclinic

 Chemical Formula : K(Ca,Na)2Si4O10(OH,F)•H2O 

  Mohs Scale : 5 - 6 

  Crystal System : Monoclinic