Mineralogy Database

Apophyllite-(KOH) Mineral Data

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General Apophyllite-(KOH) Information

Help on Chemical  Formula: Chemical Formula: KCa4Si8O20(OH,F)•8(H2O)
Help on Composition: Composition: Molecular Weight = 759.07 gm
   Potassium   4.38 %  K     5.27 % K2O
   Sodium      0.45 %  Na    0.61 % Na2O
   Calcium    21.12 %  Ca   29.55 % CaO
   Silicon    29.60 %  Si   63.32 % SiO2
   Hydrogen    0.11 %  H     0.95 % H2O
   Oxygen     43.84 %  O
   Fluorine    0.50 %  F     0.50 % F
                -   %   F    -0.21 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.85Na0.15Ca4Si8O20(OH)0.8F0.2
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Ore Knob mine, Jefferson, Ashe County, North Carolina, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek apophylliso - "it flakes off" and the predominant hydroxyl anion.
Help on Name Pronunciation: Name Pronunciation: Apophyllite-(KOH) + Pronunciation Say APOPHYLLITE-(KOH)
Help on Synonym: Synonym: Hydroxyapophyllite - Renamed to Apophyllite-(KOH) by Mineralogical Record, v39, (2008), p 131