Mineralogy Database

Tacharanite Mineral Data

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General Tacharanite Information

Help on Chemical  Formula: Chemical Formula: Ca12Al2Si18O33(OH)36
Help on Composition: Composition: Molecular Weight = 2,180.68 gm
   Calcium   22.05 %  Ca   30.86 % CaO
   Aluminum   2.47 %  Al    4.68 % Al2O3
   Silicon   23.18 %  Si   49.60 % SiO2
   Hydrogen   1.66 %  H    14.87 % H2O
   Oxygen    50.62 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca12Al2Si18O33(OH)36
Help on Environment: Environment: In vesicles or fractures in dolorites or other basic igneous rocks.
Help on IMA Status: IMA Status: Approved IMA 1961
Help on Locality: Locality: Portree, Isle of Skye, Scotland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Gaelic "tacharan," a changeling, because on standing in air the mineral breaks down to form other compounds (not noticed by later investigators).
Help on Name Pronunciation: Name Pronunciation: Tacharanite + Pronunciation Say TACHARANITE