Mineralogy Database

Arrojadite Mineral Data

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General Arrojadite Information

Help on Chemical Formula: Chemical Formula: KNa4CaMn++4Fe++10Al(PO4)12(OH,F)2
Help on Composition: Composition: Molecular Weight = 2,151.01 gm
   Potassium    1.82 %  K     2.19 % K2O
   Sodium       4.28 %  Na    5.76 % Na2O
   Calcium      1.86 %  Ca    2.61 % CaO
   Manganese   10.22 %  Mn   13.19 % MnO
   Aluminum     1.25 %  Al    2.37 % Al2O3
   Iron        25.96 %  Fe   33.40 % FeO
   Phosphorus  17.28 %  P    39.59 % P2O5
   Hydrogen     0.07 %  H     0.63 % H2O
   Oxygen      36.82 %  O
   Fluorine     0.44 %  F     0.44 % F
                 -   %   F    -0.19 % -O=F2    
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KNa4CaMn2+4Fe2+10Al(PO4)12(OH)1.5F0.5
Help on Environment: Environment: Occurs at a high temperature (approx. 800 degrees C) primary mineral in granite pegmatites. Now is the series name.
Help on IMA Status: IMA Status: Renamed IMA 2005, Dana # changed from 41.7.2.1
Help on Locality: Locality: In Brazil, from the Sierra Branca pegmatite, 13 km south of Pedra Lavrada, Picui, Paraiba; in the Enio pegmatite mine, northeast of Galileia, and the Sapucaia pegmatite mine, about 50 Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor Miguel Arrojado Ribeiro Lisboa (1872-1932), Brazilian geologist. Arrojadite {1925) is renamed arrojadite-(KFe) and arrojadite becomes the group name.
Help on Name Pronunciation: Name Pronunciation: Arrojadite + Pronunciation Say ARROJADITE
Help on Synonym: Synonym: ICSD 100872
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