Mineralogy Database

Charoite Mineral Data

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General Charoite Information

Help on Chemical  Formula: Chemical Formula: K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)•3(H2O)
Help on Composition: Composition: Molecular Weight = 1,828.68 gm
   Potassium  10.69 %  K    12.88 % K2O
   Calcium    17.53 %  Ca   24.53 % CaO
   Silicon    27.65 %  Si   59.14 % SiO2
   Hydrogen    0.39 %  H     3.45 % H2O
   Oxygen     43.75 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K5Ca8Si18O46(OH)•3(H2O)
Help on Environment: Environment: Occurs within a syenite massif, in metasomatic rocks, formed between 200-250 deg. C and enriched with K at the contact of the massif with limestone.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Murun massif, Chara River area, Aldan Shield, SW Yakutia (Sakha Republic). Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the impression that it gives: "chary" in Russian means "charms" or "magic" and not for the Chara River, which is 70 km away from the locality.