Mineralogy Database

Anorthoclase Mineral Data

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General Anorthoclase Information

Help on Chemical  Formula: Chemical Formula: (Na,K)AlSi3O8
Help on Composition: Composition: Molecular Weight = 266.25 gm
   Potassium   3.67 %  K     4.42 % K2O
   Sodium      6.48 %  Na    8.73 % Na2O
   Aluminum   10.13 %  Al   19.15 % Al2O3
   Silicon    31.65 %  Si   67.70 % SiO2
   Oxygen     48.07 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.75K0.25AlSi3O8
Help on Environment: Environment: In high-temperature sodic volcanic and hypabyssal rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1885
Help on Locality: Locality: Rather abundant worldwide. Some localities for well-characterized material include: on Pantelleria and Ustica Islands, Italy. At Larvik, Norway. From Berkum, North Rhine-Westphalia, Ge Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "oblique" and "fracture," descriptive of the cleavage
Help on Name Pronunciation: Name Pronunciation: Anorthoclase + Pronunciation Say ANORTHOCLASE
Help on Synonym: Synonym: ICSD 31180
  PDF 9-478
  Soda Microcline